I used it in a 85 mazda b2000. I first used it at about 10,000 miles, i started it up right after the dose of slick 50 and a complete oil change there was no more ticking that I always got prior to using it. After 50,000 miles it began to tick again after oil changes so I gave it anothr dose and then was quiet again till about 100,000 miles. I did notice that the oil light did not stay on right after oil changes as long either after the dose.