Posted by Jeff nwoh on November 28, 2017 at 20:45:36 from (174.233.130.18):
In Reply to: 6.0 chevy posted by stonerock on November 28, 2017 at 15:50:48:
Change your oil filter first. Easy and cheap.
I have a 2008 with the 5.3. Different motor but similar. I bought it with a bad lifter on one of the active fuel management cylinders. I changed cam, lifters, etc deleting all the afm stuff. I didn't change oil right away. I was going to put a couple hundred miles on it and then change to let anything that may have gotten in the motor get cleaned out.
It had crappy oil pressure. Maybe 7 at idle hot and 20 going down the highway. Not low enough to set off the warning light, but it did throw a code for oil pressure. I was sure I was going to have to go back in and do rod, main, and cam bearings. Only 100k miles but 15,000 hrs of run time on the truck.
I was talking to mechanic buddy about it and he loaned me his oil pressure setup to double check the dash gauge. It goes on in place of oil filter. Lo and behold, without the oil filter on the pressure went to 20 at idle and 35 to 40 at 16-1800. I put another filter on it, and it's been the same ever since. For what it's worth, it was a Delco filter that was causing the problem.
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