S J Strait
Well-known member
How dose every one feel about ZMax oil treatment? My 99 Suburban gives a little rattle on start up sounds like wrist pins . need to make it last a little longer?
I am sure that some will disagree with me on this. That any additive for "modern" lubricants [probably] will do more harm than good, or at least no good at all. With that said; Two things come to mind. 1 - many GM engines have had that problem right out of the box, and the "1999" era was about the beginning of such problems. 2. Though there is certainly some wear in the engine, if the wrist-pins are truly "slapping" you probably won't solve the problem with anything but replacement of mechanical components, and something that worn will continue to "geometrically progress". But considering the fact that your problem is at cold start, and synthetic oils have better "cling" properties when compared to their same-rated conventional lubricants, you may benefit from the switch. If you are already using synthetic oil, then study your owners manual and look to the next higher viscosity.S J Strait said:How dose every one feel about ZMax oil treatment? My 99 Suburban gives a little rattle on start up sounds like wrist pins . need to make it last a little longer?