In your opinion what is the best synthetic oil to quiet down the noisy valvetrain in an LT1 or LS1 engine? These engines often come with noisy valvetrains in addition to another tapping noise that comes more from the bottom-end (not sure if its piston slap or what but it is noticeable). Both noises are bothersome, especially when you pop the hood and want to show off your engine running and all you hear is clicking and tapping from all around the engine. I hear that many people experience this with M1 oils, i am one of these people but I also have not found any oil that actually quiets the noise down.... I've experienced most of both of these noises when using straight M1 10W-30, little less with mix of M1 10W-30 and 15W-50. Recently I switched to M1 T&SUV, somehow hoping the noise would quiet down, but I still have it as bad as before. I've heard some people have good results using Redline to quiet these noises, any truth to that? I've tried Redline for one interval, but didnt see much difference myself, same for RP 41.... Anyone out there getting some good results at quieting these noises?