Used Motor Oil As Fuel

[MajMike]

I've got a pile of US military documents around here somewhere that discuss the use of motor oil mixed with diesel fuel for use in their HMMWVs and other vehicles. In short, the military very strongly discourages the practice.

They said it actually reduces performance because oil/fuel mixes are less combustible than diesel fuel. Other papers cite carbon buildup on pistons and rings as a problem unless the vehicle is used in ways that generate higher exhaust temperatures.

I'd not want to use more than a 50/50 mix, and I'd not want to run it in the winter (too cool exhaust temps to burn efficiently).

I agree, I would only do so in an emergency (ie. SHTF), what about the mineral oil as mentioned above, any thoughts?