2008 suburban oil pressure

Asked by Mar 25, 2016 at 07:10 PM about the 2008 Chevrolet Suburban LTZ 1500 4WD

Question type: General

2008 suburban 5.3 flex fuel has 20psi at hot idle 35 at 2k rpm this
considerably lower than my last suburban which was 40psi at idle and 60psi
driving I already replaced oil pressure switch and screen. After 50 min drive it
dropped to 10psi and set code. Any ideas

6 Answers

37,905

I have heard on some of the 5.3L that you may have to replace the oil pump. Best to put in a high volume oil pump.

1 out of 1 people think this is helpful.

I just replaced GM oil filter with wix 57060xp filter and now it idles at about 38 and driving makes 50psi.

37,905

So your saying you haven't changed the oil since you had this? If the oil filter was causing the problem then I would be changing the oil & filter more frequently to get the motor cleaned out.

37,905

Sounds like the oil changes have not ben kept up with.

I just bought the truck from a chevy dealer that had changed the oil before I picked it up, I only put about 1400 miles on it till now. so like always since I grew up in an oldsmobile dealership that my family owned and I am now a service manager and master tech for Harley Davidson. I change my mobil 1 every 3k miles. also after driving 2 hours this morning it sits at about 35psi at a light and goes to maybe 47psi while driving

37,905

Well that doesn't sound bad. Pretty normal from what I have seen.

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