Quoting : https://www.survivalistboards.com/threads/waste-motor-oil-as-fuel.149248/post-5102342
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What you'd like to look for is a diesel engine with a VE pump (injection pump.) These include older Cummins 4bt/6bt, chevy 6.2/6.5, ford 7.3, vw 1.5d 1.6d 1.9d AND 1996-2003 TDI's (same exact pump...