I have used PTFE in engines before.
The one where I used it the most was my 6.5L diesel engine build.
I sparyed the main and rod bearing shells with a light coat of remington dry PTFE spary, then put a fairly thick coat on the injector pump driver gear and used a PTFE and wax "dry chain" lub on the timing chain.
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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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