Oil pressure

Asked by Nw6708 Feb 21, 2019 at 07:49 AM about the 1992 Chevrolet C/K 1500 Silverado Extended Cab RWD

Question type: Maintenance & Repair

I have a 92 silverado the oil pressure gauge will
read 25 to 30 psi when cold after warm when I stop
I will read so low the check gauge light comes on
once I rev it or take off it goes up to 20 psi or so I
was told it might be the cluster my temp gauge will
sometimes read over half way if I tap on the front
of the gauge the temp needle will go down it has
93000 miles I knocks a little upon cold start
nothing after warm does idle a little rough when
stoped and pressure reads low been driving it like
this for over a year this leads me to belive its not a
pressure problem but unsure

1 Answer

22,185

Everything you said indicates you do have a low oil pressure condition when the engine is warm. The knock upon cold start indicates no oil in the bearings (due to wear) until the oil pump gets going. I would start with a heavier weight oil. If you are using 10W30 go to 10W40 or just a 40 weight.

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