Quote:
Originally Posted by blueyed tuner
Check the GM Bulletins on the make and model of the engine. At one time there was a bulletin out that stated GM had some pumps with faulty relief valves. You would start engine up cold with good pressure and as the engine warmed the relief valve would stick open, as the engine would cont to warm to operating temp the oil gets slightly thinner and if the relief doesn't close slightly at this temp you have low oil pressure. When the engine cools the relief unsticks and closes so when time for the next start up your oil pressure seems to be normal. It will drive you insane. May not be the problem, but something to check I guess. I will check and see if I can find the bulletin info.
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would this be the case on a new pump from 2011?
Quote:
Originally Posted by Pesce Nero
i dont know because i have never put pee in my oil pan before. 5-30 just seems awefully low for any engine to me although i realize some of these newer motors call for that weight.
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5w30 is recommendation from GM for these motors