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I have almost the same year 6.2L based truck.
Just adding vegetable oil will make the fuel much more oillier.
I dispose of used motor oil by way of the fuel filler. The worst I have ever done was 6 quarts of used motor oil into the 25 gallon tank, every time I changed the oil.
One of my first mods was to can the stock fuel pumping and filtering system for one of my own design and it has worked well since 2006.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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