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**Boog** · 11-11-2012, 10:28 AM

My 2000 GMC 5.3 with 151,000 miles has the piston knock on the first start of the day. It's loud enough that I let it idle until it stops before putting it in gear and driving away. Being in a warmer climate I use 10w30 oil in my vehicles. Always change AC filter with oil.
Just curious if a different weight oil has any effect on the noise problem.
And do all GM engines since then have the same issue or what did GM do to stop this? I don't notice my '06 having the same noise at 102,000 miles.

11-11-2012, 10:28 AM	#20
Boog laying low Join Date: Mar 2001 Location: Searcy, Ark. USA Posts: 13,011	Re: Engine noise 2000 Tahoe 5.3 My 2000 GMC 5.3 with 151,000 miles has the piston knock on the first start of the day. It's loud enough that I let it idle until it stops before putting it in gear and driving away. Being in a warmer climate I use 10w30 oil in my vehicles. Always change AC filter with oil. Just curious if a different weight oil has any effect on the noise problem. And do all GM engines since then have the same issue or what did GM do to stop this? I don't notice my '06 having the same noise at 102,000 miles. __________________ Boog 69 Chevy stepside, 358/T350, 4.11 posi, 4.5/4 drop, rallys, poboy driver primer is finer 91 Chevy sportside, Tahoe, Yukon & GMC Crewcab All GM..'nuff said. I stand for the flag and kneel at the cross