I don't know about running 0w-20 oil in that old 3.1L, I know I wouldn't try it.
Good job catching that stuck open thermostat, it was likely in the process of failing.
Just hang a big air dam some where near the front and you should be all set, for now.
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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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