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RV Processes Own Fuel on Cross-Country Trip

Posted by Zonk on Sat Dec 09, 2006 04:12 AM
from the one-point-twenty-one-jiggawatts dept.
An anonymous reader writes "Frybrid has realized the dream of Dr. Emmet Brown's Delorean: putting garbage directly into your vehicle, and have it be turned into directly into fuel. This past fall, Frybrid installed a system into a 40' luxury RV that sucked up waste vegetable oil from the back of restaurants, removed the water and filtered it, and then burned the dry and cleaned vegetable oil as fuel. The family drove their converted RV from Seattle to Rhode Island on $47 worth of diesel fuel. Plans are underway for a smaller version of the system to fit in the bed of a pickup truck."
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  • IF (Score:3, Interesting)

    by Anonymous Coward on Saturday December 09 2006, @04:15AM (#17172232)
    If it ever catches on. Veg oil will cost just as much as gasoline.

    Already at many places you can't get it free anymore.
    • Yep, and the news will always report the international market price for french fries per barrel.

    • Thats just it, it will not catch on and prices will remain low, or at least mostly free.

      As it is, Diesel is not a popular technology in the United States. Most consumers in northern states avoid it for fear of jelling in cold weather, and Diesel all-around has gotten a bad reputation for small vehicles. Consumers prefer Gasoline to Diesel. The only place where Diesel is strong is in the transportation industry as just about every transportation truck fleet is Diesel powered. Now, considering that consu

      • Re: (Score:3, Interesting)

        Although slow, personal use of diesel is gaining ground. Honda has the Diesel CR-V coming to the states in the next model year or 2.

        Also, the more people talk about it, the more interest it will gather. Maybe not all people with diesels will convert, but it is more people aware of it. I have a close friend that I have helped him convert 2 diesels to run off of WVO. We live in the Chicagoland area. First was a 1985 K5 Blazer, the second is and he is currently driving, 2005 Chevy Silverado HD Duramax 25
      • Re:IF (Score:5, Interesting)

        by timjdot (638909) * on Saturday December 09 2006, @11:13AM (#17174382) Homepage
        Talked to a guy who owns some trash trucks and said in NY there was a vendor who processed the oil and added additives so it ran in the trucks WITHOUT modification. Sold for $1.04/gallon and guy said he was saving $300/month PER TRUCK. NY state government shut them down. Said antitrust law makes it illegal to sell for less with like 4 cents below the established price. E.g. legally it is illegal to sell vegetable oil for less than diesel in the state of NY. I'm sure this is the same sort of nonsense going on in all states.

        Folks, the road to freedom is exactly like this article. Home power production. The aristocrats will continue to make competition illegal. Just take a look at how handily electric power was killed. Hobbyists in the mid-1990's were making cars which could go twice what Ford and GM were able to make. Surprise. Guess a garage is better than a lab! Not to mention the millions to billions of subsidies the country spends on oil and oil-related infrastructure rather than spending such on electric (induction charging stations, power rails, etc).

        Technology in this country is presently eliminated by large corporations and the government who works for them. Only by innovations and a concerted citizen adoption and cooperation can innovation be reborn in the USA. The vege-diesel is going to be a big problem for the lawmakers who work for the MNC's because the technology works. People are driving around in trucks powered by vegetable oil. And, yes, saving money. It's a fact.

        The government, at least in NY State, has outlawed this. What does that mean? Like Cubans are we under a regime who wants us to stay in the 1900's? Is this like so many science fiction novels where individuals are not allowed to excel. Yes. It exactly is. Soon, perhaps, the personal use of innovative technologies will be made illegal - for the corporate good of course.

        TimJowers http://www.serviza.com/ [serviza.com] Fully Loaded Innovation. Power on and GO!
      • Re:IF (Score:5, Informative)

        by Skynyrd (25155) on Saturday December 09 2006, @02:07PM (#17176326) Homepage
        As it is, Diesel is not a popular technology in the United States. Most consumers in northern states avoid it for fear of jelling in cold weather, and Diesel all-around has gotten a bad reputation for small vehicles. Consumers prefer Gasoline to Diesel. The only place where Diesel is strong is in the transportation industry as just about every transportation truck fleet is Diesel powered.

        Too bad about the misinformed Northerners. Every place with cold weather that sells diesel fuel switches to "winter blend" when it gets cold. There's other technology to keep fuel from gelling as well.

        The reason the diesel has a bad reputation falls squarely on the shoulders of GM, who converted their small block Chevy engine to run on diesel back in the 70's. To say it was a steaming pile of crap would be unfair to the piles of crap. People hated them for good reason, and that's what people remember (as well as a handful of French diesels that sucked almost as much).

        If you get away from cities, the use of diesel is far more common. People who drive trucks for work, rather than show, have figured out that diesel is the way to go. My 7,200 pound 4x4 diesel powered work truck gets better mileage than my girlfriend's V-6 gas powered 2 wheel drive Ford Explorer. Better in town and better on the highway. My mileage drops by 2 to 3 mpg (down to 15-16 mpg) if I'm towing 5,000 pounds - but my friends with gas trucks get 6 to 10 mpg with the same load. Gas engines make great horsepower, but Diesels make great torque - and torque is what gets work done.

        Now that the US is changing the sulfur content of diesel fuel, we'll be able to get small, diesel powered Euro cars again, and it will be a good thing. A great thing. A friend of mine has a (roughly) 5 year old VW Jetta, and he gets 49 mpg at 70 mph. Better than a hybred, without the hassle of throwing away a bunch of batteries in a handful of years.

        Bring on the diesel!
    • Re: (Score:2, Interesting)

      Quick quiz, what happens to overall fuel prices when supply increases far faster than demand?
      • simple, it has a smaller supply, once the demand goes up it'll most likely level off around the same level as the equivalent fossil fuels.
      • That's true, but often restaurants that don't have disposal contracts will allow WVO users to siphon off their grease from the barrels out back for free. And if you only end up using oil you buy yourself, you can at least use it to cook with first.
      • Last I checked, vegetable oil you could actually put in your car costed more per gallon than gasoline...

        Not in the UK... :(
      • Re:IF (Score:4, Informative)

        by phantomlord (38815) <phantoml@@@rochester...rr...com> on Saturday December 09 2006, @04:49PM (#17177972) Journal
        Having just left the restaurant industry (again)...

        We paid the disposal company $35 a month for rental of the grease dumpster. In return, they hauled the it away. We got nothing for the oil itself. That's just the way it is around here.

        That said, earlier this year, we had a guy ask us if we'd fill his 2.5 gallon buckets with our leftover oil... and we said yes... for a while. Instead of just taking the bucket oil, flipping the lid on the dumpster open, quick pour and closing the lid, we had to spend 5 minutes prying lids off buckets, dumping a little here and a little there, resealing the buckets, etc. It went from a 60 second job to a 10 minute job so we stopped doing it. Figure 4.5 hours of pay a month wasted in messing around with his buckets at about $16/hr by the time you figure in taxes and other hidden fees with the wages and you're looking at it having a cost of $72 a month to fill up his buckets. To top it off, we'd supply him with oil faster than he could use it, which meant we had to keep that $35 dumpster around anyway. He refused to pay anything for the oil, stating that he was doing us a favor by getting rid of it...

        I'd estimate that our one little restaurant probably went through... 6-7 gallons of oil per day. Having managed the sole (old, large style) McDonalds in a college town 10 years ago (ie, they probably had the highest oil usage of anyone in the area at the time), I'd guess on memory that we went through about 10 gallons a day there. There isn't enough used oil to fill up the cars of the employees every day, much less have any kind of impact on large scale use.
  • ...input garbage directly into my browser, and have it turned directly into a "+5 insightful" comment ? So funny comment like this one... err... oops.. No way ? Sorry. ;)
  • Only in the USA (Score:4, Informative)

    by ChrisZermatt (892665) on Saturday December 09 2006, @04:39AM (#17172388)
    The problem with this system is that it could only ever work in the good 'ol USA -- the only country where people produce enough used fry-vat oil!

    (by the way, they've been doing exactly this for years in other places, like Germany...)
    • Re:Only in the USA (Score:4, Interesting)

      by ghc71 (738171) on Saturday December 09 2006, @05:42AM (#17172606)
      Running diesels of cooking oil has been done in the UK enough for the government to threaten prosecution for it - since vehicle fuels are taxed at a higher rate than foodstuffs, this is seen more as tax evasion than an environmental initiative.
  • Mythbusters (Score:5, Insightful)

    by Jason1729 (561790) on Saturday December 09 2006, @05:02AM (#17172464)
    They did this on Mythbusters, they took used cooking oil, filtered it, and put it into a standard Diesel truck. It ran perfectly normally.

    As they observed on the show, the only reason it's such a cheap source of fuel is because it's a waste product now. If people start using it as fuel, it will cost just as much as Diesel fuel does.
    • It would also be interesting (though non-trivial) to calculate the fundamental cost of producing vegetable oils. For example, agriculture here in Australia consumes huges amounts of diesel to till the land and bring in chemically processed fertilisers from Pacfic islands. That and what proportion of the esrth's food growing area would need to be given over to oil production to meet current demand.

      Xix.
      • by blakestah (91866) <blakestah@gmail.com> on Saturday December 09 2006, @07:13AM (#17173024) Homepage
        There's scads of papers on biodiesel, its efficiency, and cost.

        If petroleum goes up in price a bunch more, biodiesel gets to break even.

        The unmapped territory is that although it burns a hydrocarbon, 100% biodiesel
        doesn't increase atmospheric CO2, because that CO2 was removed from the atmosphere
        less than a year prior. It is cyclic in the short-term. Biodiesel could be a
        near drop-in replacement for gasoline in cars and solve greenhouse gas
        problems from automobiles. Of course, if you use peanuts instead of soybeans, and
        oil costs stay high....people bet billions on shifts like this, the shift
        to biodiesel would become reality if regular diesel wholesale prices get too
        high and we have a strong need to minimize emissions...both of which are
        very real scenarios. Both factors have shifted a lot since this white paper
        in 2002.

        http://www.eia.doe.gov/oiaf/analysispaper/biodiese l/ [doe.gov]

        • Re: (Score:3, Interesting)

          Biodiesel could be a near drop-in replacement for gasoline in cars

          Wow! Where do I sign up?

          While I was about to write some more smartassery regarding what I assume is a mistakenly placed "gasoline" where you meant "diesel", I came across something odd in http://en.wikipedia.org/wiki/Ethanol_fuel_in_Brazi l [wikipedia.org] - "Although Brazil is a major oil producer and now exports gasoline (19,000 m/day), it still must import oil because of internal demand for other oil byproducts, chiefly diesel fuel (which cannot be easily

    • Re:Mythbusters (Score:4, Informative)

      by Rogerborg (306625) on Saturday December 09 2006, @03:28PM (#17177224) Homepage
      Old, old news in UKia: Police impound cars run on cooking oil [bbc.co.uk].
      • Re: (Score:3, Interesting)

        I'd also add that vegetable oil is a renewable resource, which is a big plus in my eyes. In the US we have a huge agricultural industry. If we started using vegetable oil for fuel instead of petroleum, that would go a long way toward reducing our dependence on foreign oil. That alone would be a good shot in the arm for our economy. As a nice side effect, farming might even become a good way for a family to support itself again.
        • Uhh... HELLO...

          Vegetable oil is still a hydrocarbon fuel, and releases various gases and particles upon combustion. Furthermore, vegetable oil is no more a 'renewable' fuel than standard ff oil. They're also both waste products (though one could certainly use new veg-oil from the store).

          The amount of bio diesel produced from one acre of corn is something like 300 gallons. To me, this implies a limited production if you consider the need to grow corn for food as well.

          And given that traditional ff fuel can be
          • Re: (Score:3, Interesting)

            Are you sure about that? Vegetable oil from fast food restaurants as you have observed is indeed a waste product. Even if you only count the vegetable oil coming out of fast food places, the oil did not take millions of years to form. As for the pollution, you may be generating gasses, but the resulting output is indeed cleaner than current petroleum based diesel.

            If it becomes profitable to produce vegetable oil on a much larger scale, I guarantee you people will find ways of producing more with less. This
          • Re:Mythbusters (Score:5, Insightful)

            by Mr. Hankey (95668) on Saturday December 09 2006, @11:52AM (#17174708) Homepage
            Given current production methods, certainly. If we had the same sort of money going into farming that we now have going into finding new sources of oil, I'd bet we'd find better ways.
  • by norite (552330) on Saturday December 09 2006, @05:06AM (#17172476) Journal
    Diesel engines were designed to run on vegetable oil in the first place; Rudolph Diesel demonstrated his engine at the World's Fair in Paris back in 1900; His engine was running on peanut oil.
    In fact my own car has been adapted to run on vegetable oil, (either used or fresh) I collect used oil and filter it in my back yard, down to 5 microns. My car runs just great on it, absolutely no difference in performance, and I'm sill getting the same mileage, around 45mpg (US) or 55mpg(UK). My car's exhaust smells a LOT nicer (sort of a popcorn, or hot oil 'flavor'), and vegetable oil is a cleaner burning fuel, so emissions are lower. And of course, it's carbon neutral :o) I guess there are enough takeaways, restaurants and other food places in my town to power at least 100 diesel cars; in fact I have more oil than I can process right now, so I'm looking to expand my filtering operations.
    A friend of mine is doing the same, at his place of work, they have a canteen, and they're getting through more oil than he needs. the places that we're getting it from, are more than happy for us to take it away, because they have to pay to have it taken away, and we'll do it for free...

    now that I've gone veggie, I won't be going back. The heat exchanger kit that is installed in my car can easily be taken out and fitted into my next car. It's a win win situation:

    We're using a waste product that was grown locally

    It's cheaper (as in free!)

    We're not funding Big Oil, who are themselves supporting dodgy, corrupt, undemocratic and/or unstable regimes.

    There are some strong economic, political and ethical reasons to run on vegetable oil. For me, it's a no-brainer :o)

    • True, and there has been an industry (albeit small) that provides the hardware for some time. There is Frybrid from TFA, and in Germany we have Elsbett.
      Link to english website: http://www.elsbett.com/us/about-us/introduction.ht ml [elsbett.com]

      Elsbett used to build complete motors, today they mostly sell conversion kits for diesel cars (the US homepage seems to be a bit outdated there).
  • by tap (18562) on Saturday December 09 2006, @05:38AM (#17172592) Homepage
    When ever you read about someone with this wonderful used fryer-oil powered vehicle, they're always taking it on some cross-country trip. Is that because if they stay in one place they use up all the fryer-oil from the local restaurants?

    I'm only half joking about that. The people who advocate this stuff have the same program as the Verizon employees who can't understand the difference between 0.002 dollars and 0.002 cents. They just don't seem to grasp the orders of magnitude difference between the amount of corn oil this country produces vs the amount of crude oil it consumes.
    • When ever you read about someone with this wonderful used fryer-oil powered vehicle, they're always taking it on some cross-country trip.

      Because a cross country trip (like the one I took this summer [wellingtongrey.net]) is a damn good way to test it out over a long distance and a variety of terrains. Plus, it generates interest. What American doesn't love the idea of setting out on the open road?

      -Grey

    • Daily commutes don't make interesting news. My father-in-law has converted three vehicles to use waste veggie oil and still gets to fuel for free. This is not put forward as an end-all solution for our oil dependency. It's mostly a clever hack. Surely you can understand that as a Slashdot reader.
    • Re: (Score:3, Interesting)

      And using corn oil instead of crude doesn't actually solve the problem of CO2 emissions. The problem being that we had all this carbon nicely sequestered underground instead of polluting our atmosphere. In essence we're taking the hot, muggy, lizard-friendly atmosphere of prehistoric earth back out of storage. Not exactly a wise move, that.

      Corn oil would be zero-sum (the plants fix carbon into their biomass, removing it from our atmosphere; burning the oil releases CO2 back into the atmosphere) except fo
    • If I install a deep fryer in the back of my RV, will I have finally solved the Perpetual Motion issue? The french fries are just a tasty by-product.
    • No one said this is an answer to the country's energy needs. There is no answer. There are, however, multiple partial solutions. A percentage of cars that can run on veggie oils. More effecient and cheap-to-make solar panels. Tidal force power plants. If each of them can take a tiny sliver of the energy burden of the country, it adds up over time to a noticeable difference.
  • by jez9999 (618189) on Saturday December 09 2006, @05:52AM (#17172644) Homepage Journal
    Can it travel through time when it reaches 88MPH?
  • 1: it sticks, your car will smell of chips or whatever

    2: you have to clean your filter A LOT, lots of impurities in used oil

    3: In most countries, you still have to pay tax on it as it's classed as fuel

    4: If you want to start it in cold weather you have to heat the fuel pipes to ensure the veg oil isn't too thick to be used.

  • Very silly article (Score:3, Insightful)

    by Ancient_Hacker (751168) on Saturday December 09 2006, @09:49AM (#17173720)
    This would only be good news if:

    • The current used vegetable oil was currently being thrown away, lubricating landfills I guess.
    • But it's not, it's already going into special dumpsters, which I suspect get dumped into recycling systems that filter the oil and resell it for non-human consumption by mouth uses, such as candles, ointments, plastic feedstocks, greases, etc....
    • there were a LOT of veg oil per person being used. But if you think about it, it's doubtful that you're using more than a cup of oil a day, which doesnt translate into a significant amount of energy. Most people use at least a gallon of gas a day-- offsetting that with a cup of veggie oil is not a big win.
    • And let's not forget a good percentage of that oil is effectively consumed in the process of shipping, filtering, and re-refining the oil.
    p. Perhaps it would be better overall to nip this "waste" in the bud, and we all cut back on our consumption of fried foods. Less waste and less "waist"-- a two-'fer
  • I love this idea and would like to implement it someday. But,

    1.) I don't own a diesel vehicle (yet), and
    2.) It was 1.9 F (-16.2 C) last night. The record low in Chicago is -22 F (-30 C). Does vegetable oil freeze?
    • 2.) It was 1.9 F (-16.2 C) last night. The record low in Chicago is -22 F (-30 C). Does vegetable oil freeze?

      It doesn't freeze, but it gels at low temperature. If it has water in it, it could freeze, just like gasoline. But diesels in general can require some pre-planning on really cold days. Dino diesel can gel too, that's why we have winter diesel. And it's a good idea to have a block heater to warm up the engine before trying to start it. My truck currently has a broken block heater and last week I had t
  • this ain't news.... (Score:3, Informative)

    by veganboyjosh (896761) on Saturday December 09 2006, @10:39AM (#17174116)
    i didn't rtfa, but

    i had some friends who were traveling across the country on tour, in a rock band. they had converted their diesel van (a 15 passenger ford, if memory serves) for around 1500 bucks. the conversion tank/filter/box took up all the cargo space in the van, so they had to tow a trailer in which to put their amps, instruments, etc. the mileage still came out in their favor.
      i would not have believed it if i hadn't seen them pouring filthy used oil into the tank inside the van.

    some things they shared:

    american fast food is about the worst place to get used oil, as they use the shit out of the oil before tossing it. asian, and middle eastern restaurants were the best, cleanest oil they had seen so far.

    they got better gas mileage on the greasel than on the diesel.

    the van had a switch up front, with which to change the lines from the greasel to the diesel. apparently the veg oil doesn't burn hot enough, and it was bad news to leave the van overnight with the veg oil in the lines. so before shutting it down for the night, they'd switch back to diesel, and let it run for 10 minutes. then in the morning, they'd switch it back to veggie oil after it warmed up.

    the box in the back of the van did three things: it was a tank, in which to store the oil as it was processed, it floated out the water from the oil, (a sort of inline spit valve, not unlike on many wood instruments) and it filtered out the particulates. burnt fries, crispy shrimp tails, etc.

    the filter was at the front of the line, so it was basically a big thick sock (they got them at home depot, and had to change them about 1000 miles. it was designed for some other use, but someone figured out it's capability to clean oil, and put it in there) turned inside out. they had also bought some ordinary kitchen strainers, which fit over the hole in the tank, and would grab the huge particles before they made it to the filter. once the strainers clogged, they could lift them out and tap them on the ground to get the particles out. much easier than changing the sock like filter.

    they usually would go and ask for oil, but sometimes would need to refill after a show, which could be 2 or 3 am, so they'd just go poach it. most places paid to have the stuff taken away, so wouldn't care if you got caught taking it, but would generally assume you're up to no good if you were behind their restaurant in the middle of the night acting shady.

    with 4 guys in the band, they had a system down. some places kept the used oil in a 55 gallon drum. for this, one would scoop, one would prep the empty 5 gallon plastic tubs, one would lift the tubs into the van, and one would pour the oil into the tank.

    sometimes the places had the oil just sitting in the tubs they came in. one would either nab the full 5 gallon tubs, and put them in the van to be poured later, while another put empties in their place.

    the back of the van was messy/oily, but this was their first trip with the conversion, so were still dialing in their storage system/process. next time i see them, i predict the van'll be much cleaner. as clean as a touring rock band's van can be, anyway....

    i live in denver. they live in l.a. they drove from their home, up to vancouver, canada, and then over to denver, when i saw them. so far, on that tour, when i saw them, they had put one tank of gas in the van, and not even used the entire tank. this even includes a few hours running on diesel, as the water trap had some issues, and they had to drive around portland looking for someone who could fix it.

    i was totally impressed. i haven't driven in almost a year, but i was convinced that if/when i do buy my next car, it'll be a diesel.

    if anyone's interested in the conversion, and able to get to l.a., let me know, and i can put you in touch with the guy who did theirs.
  • by caseih (160668) on Saturday December 09 2006, @11:08AM (#17174332)
    Every year we essentially throw away a lot of vegetable oil after cooking with it at restaurants. Much of this oil gets dumped out or just incinerated. Clearly we need to recycle this oil and burning it as a fuel is a good idea. Except for NO2 and particulates (which we know how to deal with) there is no pollution from using old vegetable oil for fuel in a diesel engine.

    However the problem is that there's not enough vegetable oil coming from restaurants to impact even slightly our national oil usage. So it is a cheap fuel source for a few people. That's all. What we really need is a way to create organic oils on a large scale from algae, plants, or some other way using only energy from the sun. If we could immediately replace all our fossil fuels with organic (as it carbon-neutral) oils, we could stop our carbon emissions completely, having an immediate, dramatic, and hopefully non-warming effect on our environment.
  • by Rogerborg (306625) on Saturday December 09 2006, @03:30PM (#17177244) Homepage
    Been here, dodged the tax on that. Police impound cars run on cooking oil [bbc.co.uk].
    • Willie Nelson's tour bus has been running on Waste Vegetable Oil, a form of "Biodiesel" for a while now. Bill Maher has mentioned this a few times on his show Real Time.

      ttyl
        • The modification is changing all the rubber seals in the fuel lines to metal seals. It's not terribly difficult, but it can be expensive. The reason is because vegetable oil is harder on the rubber and will do something to it (I forget what) that makes it crack and leak. No internal engine modifications are needed, only fuel system modifications.
        • That's why I put quotes around "biodiesel". Yes, Veggie Oil is different from refined biodiesel, but both are from biological sources that were recently alive, as opposed to petrodiesel, which is made from biological sources that have been dead for millions of years.

          ttyl
    • by Mr. Hankey (95668) on Saturday December 09 2006, @06:03AM (#17172686) Homepage
      I don't think it's that bad of an idea myself. It's cleaner to burn, and if the demand goes up there will be farmers happy to produce more vegetables. I'd rather the waste vegetable oil goes toward reducing our petroleum dependency than some of the alternatives, and I don't really care if the fast food industry is one of the beneficiaries. Maybe they'll start processing the oil for cars instead of people, finding it more lucrative, and make their food a bit less greasy. We can only hope.

      Even if the waste oil is only 1% of petroleum usage, which is not all turned into diesel, if the US ramps up its resources to produce more vegetable-based fuel we'd be able to dramatically reduce the amount of petroleum going into vehicles. Most diesel vehicles in the US tend to be used in freight transport. Imagine smelling french fries or popcorn instead of the current diesel when you're behind a large truck that's belching smoke all over the place. I know what I'd prefer.
    • You should read your signature. :) This development is important not because it provides a solution to the problem you want solved, but because it adds to our tech base something that can be used as part of the solution to the problem you want solved. It has the added benefit of making good PR for alternative solutions and getting people thinking about the problem in the context that it can be solved.
    • If oil is over $70/barrel it is not so far fetched. Not the yellow grease
      based biodiesel, which is very limited in scope, but a B100 biodiesel.

      If you factor in the cost of emissions...B100 biodiesel has NO net emissions,
      and petroleum based diesel has significant emissions costs....

      Factor in the cost of emissions on environmental destruction at
      $1/gallon of fuel and keep oil over $70/barrel,
      and America has a new soybean based economy.

      I don't think that is really gonna happen, but there
      are not so unrealistic c
    • McDonald's doesn't throw away their used oil. The oil is filtered daily, until it becomes useless (usually about a week). Once this happens, a third-party company comes to pump it out of their oil tanks and refill the tanks with new oil. This old oil is reprocessed to become useful again.