Originally Posted By: NutBuster
Kendall made for some nasty piston slap in my 187K mile LS1 Camaro(even back before I turned 100K). I stuck with the 5w30 as always, but Valvoline completely silenced the noise. Other brands worked fairly decent, but there hasn't been a single tap since I started using Valvoline.
Can't explain the science there, but it worked for me, so I say try it. I can literally let my car sit for a week, and still no noise, while Mobil 1 would knock after only a few hours (M1 in an LS1 = sucks like no other).
Sounds more like startup knock, not piston slap.