Posted by fredster on September 21, 2021 at 06:02:29 from (67.167.150.241):
In Reply to: New Chevy question posted by rrman61 on September 20, 2021 at 10:02:58:
One common problem is with the AFM 4 cylinder system. The lifters in the 4 cylinders that get deactivated have a small screen in the oil passage. If you drive with light loads often, run in 4 cyl mode often, these screens start to gum up and the problem is worse if you stretch your oil changes to 6-7K miles. It results in low oil flow to those lifters, they start to stick, then they destroy the camshaft. I have a 2016 with the 5.3, 97,000 miles and it's fine...oil change every 5K miles, I tow a lot, my truck is in 8 cyl mode a lot of the time. BIL has the same truck/engine and 2 lifters failed at 90K miles and destroyed the camshaft.....$6K later and his engine was repaired new cam, lifters and a ton of labor. He doesn't tow much and gets his oil changed when the oil life monitor says to and I'm sure way higher than 5K miles. Since learning about these issues, I have deactivated 4 cyl mode in my truck, I don't miss it at all and MPG is about the same.
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