on cold start(25)low oil presure warning for about 2 seconds untill guage gets to 20psi

10

Asked by Feb 14, 2015 at 07:16 AM about the 2003 Chevrolet Silverado 2500HD 2 Dr LS 4WD Standard Cab LB HD

Question type: Maintenance & Repair

slowly warms to normal (40psi) Using gtx 5-30 and A/C Delco filter. Why low oil presure
on startup?

5 Answers

35

Its possible your oil pump is showing signs of age. I am assuming this is the 6.0L gas engine and not the duramax based on the amount of pressure at normal temp. How many miles on engine?

1 out of 1 people think this is helpful.
10

yes 6.0l 119,000 miles. Had oil change last winter, shop used bulk oil, problem started next day. Changed back to gtx prob. stopped until this winter.

1 out of 1 people think this is helpful.
35

Wow. That seems very strange but I still suspect the pump. Evidence of it with the problem starting again in colder months with the oil getting thicker and taking longer to travel.

1 out of 1 people think this is helpful.
58,925

It may be that the oil pressure sending unit is sticking in the colder weather. HTH. -Jim

10

changed oil ( after only 800 miles ) to syth, blend,5-30. problem stopped, got quick presure on start to 40 psi but ran high on highway( 50+@2500rpm) after one week got slow presure again on cold morning, (10-20f)

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