Im pretty sure animal fats (normally found in grease traps) need to be "washed" (with a strong acid) to seperate the glycerol and water out of them. Isnt this called an estherification process or something. You really dont want to use old oil used to cook saturated fats (those found from animals) unless you do all the processes needed for biodiesel. I imagine clean, uncooked, peanut oil would be fine though.

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1983 300SD White with Grey interior

The big mistake was a blend with this type of oil. With a proper two-tank WVO system you could run LARD if and only if you can heat it up enough to flow through the lines and pump. Provided the WVO is properly dewatered and filtered, correctly heated there should be no problem. When blending NO animal fat is allowable. This is the kind of stuff that gives WVO a bad name. The principle is sound but the execution lacks. RT

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When all else fails, vote from the rooftops!
84' Mercedes Benz 300D Anthracite/black, 171K
03' Volkswagen Jetta TDI blue/black, 93K
93' Chevrolet C2500HD ExCab 6.5TD, Two-tone blue, 252K

I've 60K miles on my '92 5.9 cummins running a wvo/diesel blend out of a total of around 400K miles.
No heat, single tank. I vary the blend as ambient temps change. Up to 95% wvo in the summer. Around 50/50 now to be on the safe side in case we get a cold front come thru.
No problems so far.
Cummins are tough to start if run dry.

BTW, best yet on the blend was 24.7mpg. GPS verified milage, 1ton dually.
I'm afraid my source of oil is going away though. The resturant owner lost her lease. Time to beat the streets searching.

I know you were joking but misconceptions like your turban on Iraqi's led to many Indians getting attacked after 9-11.

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82 300D....went to MB heaven
90 350 SDL....excercising con rods