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Thanks for the reply, Klutch . Glad to hear it about the piston slap - I have heard of this before, but I was just a little concerned because it became more audible during the Auto-RX treatment. Since the general consensus so far is to just use any oil and up my OCI a bit, I've done a bit more...

Ah wow Colt45ws, that sounds pretty close to (if not exactly) what my engine sounds like when cold. Sound goes away when warms up though (for the most part). But that sound didn't become noticeable until after starting the ARX treatment. As for what it sounded like on startup... it sounds like...

Hello everyone, I've been browsing the forums for a few days now... reading up on different brands and mixes of motor oil. I never knew it could be so complicated. So here I am, about to ask for some recommendations for my vehicle. I have a 2003 Chevrolet Impala with the 3400 SFI engine. It...