There are 2 different kinds of oil coolers.
Oil to air.
Oil to coolant.
The oil to air just keeps the oil from overheating.
The oil to coolant heat exchanger actually regulates oil temperature, that's why all heavy duty engines have them.
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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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