High oil pressure

Michelle Geary Johnson

Asked by Jun 14, 2016 at 11:25 PM about the 2003 Chevrolet Avalanche 1500 4WD

Question type: General

Just changed the oil and filter on my 2003 Chevy
Avalanche now the oil pressure is high 80 what
could be the problem should I change the oil filter
again ?

2 Answers


I can remember when I put a high-volume oil pump into my Impala 400 motor, started blowin' the gaskets...turns out there is a spring that you change out to affect reduced pressure...not that someone changed it out in the middle of the night, but that little guy has a spring to limit the pressure....clearly this spring has stopped doing it's job~


Sounds more like your oil pumps pressure bypass valve has stuck closed or your gauge is messed up, just turn the key on and see if the oil pressure gauge reads 80 with just the key on and the engine not running, if it reads 0 then you may want to add in a manual oil pressure gauge just to verify you actually have that much oil pressure. Note oil filters will not stand that kind of pressure for long before splitting wide open and dumping your oil and ruining your engine so be careful until you have done the verification.

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