I don’t know if it’s been asked before but I was pondering this other day. I wouldn’t do it; I’d rather use biodiesel before waste motor oil.
Anyone here run waste motor oil in their diesel engines?
- Thread starter 53' Stude
- Start date
D
Deleted member 89374
I'm a USCG-licensed captain, and I know a couple of boat owners with older 2-stroke Detroit Diesels who pour their waste oil directly into the boat's fuel tank. Those 6V-71 and 8V-71 engines hold around 28 quarts of oil, so that gives them a few hours of run time. Those old DD engines operate at a lower fuel pressure than the newer diesels. I don't think it would be a good idea on a modern diesel, unless it was run through a very fine filter/polishing system.
Do people still do this? Does Greasecar still exist? 
I guess my tractor is a prime candidate for this with lower pressure indirect injection, no emissions stuff, but I don't think its worth it really. Fuel cost isn't really factor and its got to outlast me, so meh. Plus I'd have to filter the oil again.
Very interesting. Thank You sir
sure do , 6.2 diesel 3600 rpm generator runs on 80% waste oil from various sources. stinks like h*ll and is impossible to start without a case of ether
You would want to refilter the oil through a two micron filter or you would get excessive wear on the injector pump and injectors. I don't think it would be worth the gamble. It would have to be a pre-emission diesel engine. Better selling to someone with a waste fuel furnace.
Maybe if it was a giant slow speed diesel in a maritime container ship.
Maybe apples and oranges. My last 2 OCs were drained into my nearly full 275 gallon fuel oil tank. I don't think the 0w20 with 5kmiles is gonna harm anything.
These types of guys pay all my bills. Please continue to do it.
I tried running the waste oil in my tractor but it was a mistake. While it worked it just caused it to smoke which was annoying when the exhaust is always around your face. I now use waste oil in my furnace and works great. It dilutes pretty well in all the fuel oil
There are a ton of guys that do this. Some have good results and others not so much. I thought about doing this in my older diesel trucks but there is too much stuff that doesn't burn in waste oil. Burning waste oil makes a lot of ash and carbon. I don't want that junk in my good running engines.
@53' Stude running waste motor oil aka black diesel is not something I would recommend in modern diesel engines with HPCR injection systems. Like others said above in an old DD V series sure no problem but nothing new.
Just my $0.02
Just my $0.02
I’m gonna run my waste oil in a smudge pot for heating to offset all the money I’m losing on what used to be cheap hydrocarbon fuels. That’s as political as I can get on here
It's probably on the thick side for the injectors to attempt to atomize. Maybe if you thin it with diesel fuel, it might be possible.
but the WVO folks usually start their engines on diesel, then switch over to WVO
I used to do that at approx 4L for ~60L of diesel in an old indirect injection diesel.