I don't think MaxLife ATF meets Mercon V requirements. Perhaps it used to be Mercon V compatible, but not any longer. Yes, the web site and the PDF spec sheet says that it is compatible with Mercon V, but the back of the bottle does not say this. Moreover, the bottle says that among other things, MaxLife is Mercon LV compatible. I head heard somewhere that Mercon V and Mercon LV requirements are mutually incompatible. Finally, if you look at the viscosity spec of Maxlife at 100C, it's below 7cst. Every real Mercon V fluid has this spec above 7cst. MaxLife ATF seems like a great value and no doubt a good ATF, being a synthetic fluid, but I would think twice before putting it into a transmission that requires Mercon V.