Not that I'm aware of. The two compounds are very different. The two would be completely incompatible. Diesel engines operate by burning diesel. It is specifically designed to use this type of fuel. Engine oil does not have the same properties as diesel. It does not burn the same, it would be too thick for the fuel system, not to mention the fact that used engine oil would have so many impurities (even if you filtered out the particles) that it would foul the engine straight away. The only case I've heard of oil being used is as a SOURCE of fuel. Biodiesel is created by chemically converting used cooking oil, but the end result is still a diesel compound, not the oil.

I think engine oil don't contain enough enegy properties to be burnt to produce energy, more carbon and less hydrogen. If you remember how the crude oil is distill gasoline and diesel are closer and both are further compare to engine oil/bituemen and grease.

YES, THE OIL NEEDS TO BE THINNED WITH GASOLINE OR DIESEL FUEL TO MAKE IT THIN ENOUGH TO FLOW EASILY THROUGH THE FUEL PUMP AND THE FUEL LINES. DO A LITTLE RESURCH AND YOU WILL FIND THAT MOTOR OIL IS JUST A THICKER OIL THAN DIESEL. IF THE TREE HUGGERS WERE REALLY WORRIED ABOUT THE ENVIRONMENT THEY WOULD SUPPORT THE USE OF THIS USED OIL AS FUEL INSTEAD OF CONDEMING ITS USE. IN ALL TRUTH AND REALITY THE TREE HUGGERS WOULD RATHER SEE EVERYONE (except themselves) WALKING BAREFOOT. P.S. BAREFOOT BECAUSE LEATHER SHOES COMES FROM ANIMALS AND RUBBER SOLE SHOES COME FROM THAT NASTY OIL!

i agree with youngearth but i think it has to pe prosessd a bit to make it work

As yougearth has stated yes, used motor oil, transmission fluid, transformer fluid, mineral oil, any oil can be and is (I have ran all) in a diesel engine. No modifications to the oil other than filtering is needed. Contrary to youngearth say's DO NOT mix with gasoline. Gasoline has octane which inhibits combustion under high compression (Like a diesel engine)Mix with diesel or heat to 160f or above (Just like WVO/SVO) At 160f+ all oils have the same viscosity as diesel. I have done a lot of research and testing on this. Any questions jaggerdss@hotmail.com

I would concur with jaggerdss above. Used motor oil can be burned in a standard diesel engine. The key is in changing the viscosity to match that of diesel fuel. Heating to ~85C (185F) would be a better operating temperature. The motor oil will still flow and burn at 160F, but the atomization of the fuel in the injectors will not be as complete as at the higher temperature. Again, the viscosity of the fluid governs the size of the atomized particles which determines how well the fuel will be combusted. Also, contrary to the above, engine oil has approximately the same energy content as standard diesel fuel. Engine power and performance will be slightly less than with standard diesel fuel. The greatest concern is the release of toxins and pollutants to the environment. However, good pre-filtering (double filtration) will mitigate this issue. It is quite possible to meet EPA regulations, but emission testing should be performed on any larger scale application (power generation over 100kW for example). For a single vehicle engine, the pollution is not significantly worse than a poorly tuned older diesel engine. If anyone is interested, I have designed a conversion kit that works with Straight Vegatable Oil (SVO), Waste Vegetable Oil (WVO), or used motor oil. The first two are cleaner more environmentally friendly fuel sources. For more information, email mannasol@shaw.ca FYI, Jim Bererton

Yes... But you have to process it first... A group is building a personal refinery that will convert used motor oil to diesel by vaporizing the used oil and then condensing and distilling the diesel out of it... It comes out amber/clear and the right consistency. Yeah... I have built one and it works.

When useing used motor oil, transmission fluid, transformer fluid, mineral oil, any oil, it must be filtered clean. A mix of about 50/50 used oil/diesel must then be filtered. A high pressure oil furnace pump drawing oil through a 15 micro filter followed by it pumping through a 10 micro then 5 micro filter would work best (some go as low as 3 microns). If the oil is heated to around (jaggerdss quote-160f) it flows much better. If you think it does not have the BTU's your wrong. P.S. change filters on your diesel like it was a religon. This will void all warrenties.

Well i have been reading about this for a while and it would seem there are 3 type of people out there the the knockers, the want to b's and the do'ers. I have been making Bio from used vegie with Meth and costic mix as per Tasie energy for 2 years and running it in a 1996 2.8 Hilux diesel with 2nd filter with water trap, no issues a little down on the hp but all good. A mate of mine has just started running his 1985 Dihatsu rocky diesel on 50/50 sump oil/diesel other then cold starts it runs fine, pre heating the oil is a crock just have a 2nd tank (plastic 25Lt boat tank)with comercial diesel to start with then shut off with solenoids and run on black oil tank (standard Tank), works in the rocky. I now leaning towards the black oil as the vegie oil processing means fiddeling with some nasty chemicals and the black oil is a filtering and quality control process as my mate says once you have tryed black you will never go back!!

This process converts used oil into diesel http://www.globalfinest.com/tech

The two compounds are not that dissimilar. The original engine designed by Rudolf Diesel was designed to burn peanut oil, crude oil or petroleum oil at about 200 bar at this pressure heavy fuel will self ignite and a rapid burn occurs. If you have ever run arctic crude (thick oil/fuel) in your diesel you just let it run. If you shut it down it is usually a tow start to get it going, but once it is running it goes just fine. The US military design a tank to run on almost any oil you poured in it and did they pour oil in it. Baby oil, clean engine oil, not so clean engine oil, cooking oil clean/used, fish oils, caster oil, animal lard, home heating fuel and with preheat as well as a high enough pump and engine pressure it all ran the engine. Sorry forgot the 'are "NOT" that dissimilar'

We just started our 83 Bronco - yea we converted her to a diesel - on the 50/50 oil diesel mix and it has been running great! This is only our first week into it, but other then a mess in the garage setting up our filter system and technic everything is going good. Time will tell but from everything I have researched on it so far - it works great. Older motors are the choice. We think this because of all the computerized crap under the hood? Sure does not smell as good as the veggi burners - but everything store/shop with in 40 miles of us is locked up already with some one picking up the WCO and we have access to a good supply of clean (if you can call it that) used motor oil.

Well thank you for re-vitalising a subject well addressed, I have to add to my previous entry. My mate with the Rocky rang me the other day and said he blew the turbo and cracked the head between the valve port and cylinder. Though he feels it had nothing to do with the oil/diesel mix, as the head fracture fault had been noted in the last rebuild. Which beggs the questions dose the black stuff increase cylinder pressure and should turbo diesels be considered for black diesel if so what mix? and Yes I agree as dose my mate putting a faulty head back on in a rebuild is a bit of a conundreum or plain stupid. Well at least i don't have to buy a 2nd tank and solinoids now as i have been given some from a bloke with a F#$@%* Rocky. I wish this wasn't such a leap of faith and i tip me hat to those brave souls that take the leap. I,m on the edge and looking over but not quite ready to leap!

Where can I get the plans to convert used motor into diesel fuel?

Anonymous I'd like a copy of those instructions to if you find them, surely there is someone out there who is putting pen to paper with some science based knowledge. At $1.83au per litre here now i hope the do soon and share their learnings with us all. Though i think one can't dismiss the answers given thus far as they sound very logical and very plausable. No I havent taken that leap yet bought a bike instead, though stocking up on oil and still pasisting with the WVO.

I have been running used motor oil in my 98 12 valve dodge for over 22,000 miles and have had no problems so far. I filter it and mix it in the summer to 3 parts oil 1 part diesel in the winter 50/50. my truck has the bosch p7100 pump and from everything that I have read it will handle it. Most of the rotary type pumps will not (from research not real life experiences on my part ). I hope this helps.

It seems like lots of people have been running fine on used motor oil with a heating system. I have a heating system for my wvo but it is getting much harder to find free veggie oil. It seems there is an almost unlimited supply of used motor oil from commercial auto places but their waste buckets have a mix of synthetic oils and non synthetic. WIll this make a difference? It seems all the people online have only been using non-synthetic. Also g'daymate or whatever your name is, Where did you get your hilux from?

Yes it can. It must be properly filtered and no water (centrifuge filter is the best way). Then depending on climate,waste oil type and engine type (Direct Inject or Indirect Inject) will determine how much (if any) diesel to blend with it. If pre-heated like in a WVO two-tank system then you can run close to 100% (depending on the other mentioned factors). The military has done this for decades.Anyone tells you can't or it will blow your motor up is full of it(I can back that up). And the guy that states he "distills it" is one of those that is full of it. Filtering is basically all that is needed.

I have a 10 hp diesel generator and have burned wmo (10/40,0-40synthetic and 80/90 wt gear oil) The diesel didn't smoke even with the gear oil 75% oil 25% diesel. The synthetic was hardest to burn but worked well also at 75/25. 10/40 wmo burns great at 90%/10% diesel. The engine naturally warmed the oil before it went into engine. I live in Hawaii and it's always warm so the viscosity problem is reduced here.

You can use ordinary vegetable oil (chip pan oil), but it has to be cleaned and filtered or the fragments will clog all kinds of stuff in your engine. It is done on a commercial scale here, and it's slightly cheaper than diesel.

[quote="Shabba"] Diesel engines operate by burning diesel. It is specifically designed to use this type of fuel. Engine oil does not have the same properties as diesel. It does not burn the same, it would be too thick for the fuel system, not to mention the fact that used engine oil would have so many impurities (even if you filtered out the particles) that it would foul the engine straight away. The only case I've heard of oil being used is as a SOURCE of fuel. Biodiesel is created by chemically converting used cooking oil, but the end result is still a diesel compound, not the oil. [/quote] Boy I wonder how I have gotten oil to run in more diesel engines that I can count for the last 15-20 years? Seems to pull my boat the same as diesel? Seems to not smoke out the tailpipe the same as diesel? Yes it is thick but once heated it flows the same? this one particular truck has ran like this for the last 8 years has has not fouled so how long is "straight away"? I thought diesels were made by Rudolph Diesel to "specifically" run on peanut oil? When you log some hours in the real world come back and post a real answer. "Can used engine oil be used as fuel for a diesel car?" YES Period! Whatever environmental motivation people may have does not change this simple fact.

yes i have heard it works after proccessing bu used vegetable oil that is processed with methonal and pottasiam hydroxide to make bio diesel is better as i make this and have run it neat in my car for over a year

Not directly in an unmodified diesel engine,but it can be processed chemically into diesel fuel. It's a similar process as used in making biodiesel. +5