Quote:
Originally Posted by Rattletrap
would this be the case on a new pump from 2011?
Well, that is a valid point. You would think they changed the way they make the new pumps. Well I was trying, maybe if or when you pull it down you can check and see if there are any signs of it sticking. I will make an effort to find that bulletin to see what years it covered.
5w30 is recommendation from GM for these motors
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This is correct and usually if anything thicker is used it makes the valvetrain noisy, Just saying.