I know this has been posted ad nauseum, but all the threads I could find were 3+ years old. With some of the newer oils out there (and the reformulation of MaxLife again, as well as more data behind Dex IV) - whats the general consensus? I have some Penzoil Dex III, and some of the newest MaxLife. Which would BITOG use, if there was a choice?? Anything else I SHOULD be considering? Not dropping the pan, this is just a drain and fill.