thermostat won't open

jdub

Official SM Expert: Motor Oil, Lubricants & Fil
SM Expert
Feb 10, 2006
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Valley of the Sun
The oil system can handle that pressure easily. I would use Castrol European Formula 0W-30 (aka German Castrol) in that motor - you can get it at AutoZone or PepBoys...more info in the Lube section. Might want to read the Motor Oil 101 link in my sig.

Yes, you should see a slight drop in pressure using GC.