[camarokid02]

Originally Posted by VetNutJim

I'm a little late to the party on this but......

A lot of the LS1's seem to have a little piston slap on cold starts.
Many folks have reported it and GM has acknowledged it but says it is perfectly normal.

The 5w30 oil is really thin when it's cool and that doesn't help either.

My 98 does it, has always done it since brand new. It hasn't changed or gotten better/worse in the last 98,000 miles.

I would NOT use any oil additives on mine.
It's straight 10w30 Mobil One for me since new and it gets changed every 3000 miles.

but be aware that the thicker the oil, the more problems youll have starting and risking more in the cold, the reason 5 w 30 is standard is because it performs well in a wider range of temperatures compared to the heaview thicker 10w30