Diesel engines were designed to run on deep fryer grease. These 'true believers' never heard the coal dust story.

My favorite:
A diesel engine will run backwards (IE: it can use the exhaust as an intake and vice versa.)

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1987 300D (230,000 mi on a #14 head-watching the temp gauge and keeping the ghost in the machine)
Raleigh NC - Home of deep fried sushi!