gm = crap... they build their cars with a short lifespan in mind (as long as it'll hold together till the warrantee runs out, that's their only concern) IMHO toyota = much better quality
I used to drive 500 or so cars a day at work, so believe me when I tell you, those cars fall apart, and...
used low mileage jdm motor (30k miles or so)
5w30
the most i'll ever see is 38-39 psi even at WOT
cold
20 or so psi @ idle
38 psi while crusing @ 2500-3000
warm
35 psi @ 2,500 @ operating temp the most i'll ever see is 38-39 psi even at WOT
7-8 psi @ idle @ operating temp
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