i am not jumping on the bandwagon-yet. i did buy and fill with GC, Napa gold filter. ran Schaeffers 10w30 last 3 runs. mixed some LC in with the green stuff. i can say this. my startup noise is GONE. now, this motor has 142K, but had chatter with Amsoil 5w30 and Schaeffers-likely the thicker weight on an older motor. in the teens today, and no noise. i plan on running this stuff 10k, probably through March. we'll see.