tom3

Thanks for the info. Service department didn't have the Mobil 1 in the right weight so it was changed with the Dexos1 oil. Service write up calls it synthetic? But I'm guessing that with the 0w20 oil some cold start noise might be normal as you say. I'm pretty old school, engine rattle is usually bad except for loose cold forged pistons. Had 4000 miles on the old oil, curious if the fresh oil will make a difference. Thanks again. Tom.

New member, thanks for the add. Our 2019 with the 5.3 V8. After sitting a couple days and somewhat cold weather here on the first startup for the day I get a second or so of engine rattle. Not a piston slap or main bearing rattle but a trashy sounding clattering. Hard to describe. Now at 12,000 miles and I'm going for a third oil change. Would a better oil help this than the usual Dexos? I see a Dexos 2 oil out now. I also see a Dexos 1 version 2 that I guess is for little turbo motors, pretty sure that's not what I'd want for the V8 here. This would be a dealer service (until the warranty runs out) so I'm stuck with what they have. Any opinions or suggestions appreciated. Thanks.