used engine oil as Fuel?

[ally406]

Yes, illegal unless you find a way to pay duty on it. I tried it back in 2007 when duty was not payable on this fuel type. Bit of a bastard to start, but once running, I thought the engine actually had more torque (this makes sense, engine oil has a higher energy density). It burns a lot cleaner than some hysterical types will try and tell you, however there are many issues to consider like injector coking and metal particulates. It seems to be more common place in the US and centrifuging seems to be the way to do it (so called "black diesel"). If I didn't have a good source of WVO I might investigate paying duty to HMRC, you could still end up with fuel around 50ppl, and last time I looked, garages were delighted to have you take it away free of charge.