2007 5.3 GM engine 6 ksi at idle oil pressure normal

Asked by Mar 09, 2014 at 07:39 PM about the 2007 GMC Sierra 1500 SLE1 4WD

Question type: Maintenance & Repair

On my 2007 5.3 engine Oil pressure is at 35 ksi when start engine cold and when warms
up  pressure drops  to around 6 ksi at idle, when running  holds around 28 ksi with 8
cylinders when deactivates to 4 cylinder goes up to 45 ksi

Check engine light comes on after engine warms up and stays on. It has been doing this
for around 40,000 miles. I changed oil pump about 18 months ago when first started

Is this ok/normal?

Anything I can do to increase oil pressure? I currently use 5W-30 oil

5 Answers

Also when engine is warm at idle runs at 500 rpm and oil pressure is at 6 ksi Running on 8 cylinders at 2200 rpm oil pressure is at 28 ksi

735

most 5.3 should run at about 40psi mayb 30 at lowest on idle, if ur turning 2k rpm on highway should be around the 50psi mark, u could have a bad seal at oil pump or something, power-train warranty from gm covers til 160k or 5yrs, u may get lucky, if you change oil to a diff viscosity you could run risk of running bearings dry especially since ur having oil pressure issues, i run 5w40 cj 4 rated heavy duty rotella t oil in my 5.3 gas ( yes its desiel rated oil)

What does this type of oil do?

735

the oil i run has a better additive package designed for heavier duty use, i use my truck for a truck, hauling, payload, higher rpm range, i find its less inclined to burning as well, you can try using it but i would recommend finding the root cause to ur oil pressure issue, sierra/silverado forums reali help with ideas and eliminating and narrowing down ur issues

10

Hi Textiger66 did you fix the issue with the low oil pressure?

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