+1all the oil manufacturers advise to NOT use any additives
remember all the Teflon stuff in the 80's? it was all crap
the only additive I've found to work is Marvel Mystery oil on noisy hydraulic lifters and as a lead substitute in older engines
+1
What does Z-max do with their exorbitant profit for selling essentially snake oil that does more harm than good? Litigate in court.
A travesty that the great racer Carol Shelby endorses the stuff. I only hope he donates this money to one of his excellent charities.