I have a both a mercedes and a VW diesel, I have considered refining
"Greasel", but even at 300-400 miles a week, it's not worth it to me to mess
with a slimy mess of restaurant grease and figure out what to do with the
glycerine.
I ran 20 gallons of expired-date peanut oil in the Benz, ran fine, but it
was free. Vegetable oils still cost more than diesel.
--
Stupendous Man,
Defender of Freedom, Advocate of Liberty