Ive heard that Zmax/BoostR/Miracle-Wonder-Oil-O is a fantastic new engine oil additive. Is it really any good?
I don’t know. I don’t put additives in my oil for reasons outlined in the oil bible. As I don’t use them any more, I can’t post opinions about them, nor can I libel the companies concerned (these people have lots of clever lawyers). If that new product really is endorsed by Nascar or FIA, then why don’t you ever see it on shirts and hats in the pit lane, or on mechanic’s workbenches in the garages?