I ran Royal Purple MaxATF in my truck for about 6 months. It did seem to shift a tad better at first but with in a month it was getting worse.
I do
BELIEVE my TC was already starting to bake before I ever put the Royal Purple in my transmission so I'm
NOT saying that RP baked my trans!
But when the truck was in the shop I did some research on if I should put the RP back in or go with something else after they were done.
Dave reminded me that up until a few years ago no one made a ATF+4 for Dodge except Dodge. It was a proprietary formula. That got me thinking OK who
does Dodge allow to make their special secret formula then?
First thing I learned was that the Mopar ATF +4 is a full synthetic right from the factory. Our automatic transmissions never run a dino oil in them.
Next thing I learned is some brands are licensed to re-brand: just use the same formula as Chrysler and some are licensed to blend: modify the formula with in specifications.
The most interesting part I learned...is neither Royal Purple nor Amsoil (Tommy / Ray you find me proof that Chrysler has licensed them to reblend and I'll change this) are on their list.
http://www.centerforqa.com/licensedatf4brands.htmlAdvance Auto Parts ATF+4®
Carquest ATF+4®
Castrol ATF+4®
Chevron ATF+4®
Citgo Transgard ATF+4®
Coastal ATF+4®
Conklin ATF-Xtra Plus ATF+4®
Formula Shell ATF+4®
Great Wall ATF+4®
Havoline ATF+4®
MAG 1 ATF+4®
Mobil ATF+4®
Mobil Super ATF+4®
Mopar ATF+4®
MotoMaster ATF+4®
NAPA ATF+4®
Northland ATF+4®
O’Reilly ATF+4®
Parts Master ATF+4®
Parts Plus ATF+4®
Pennzoil ATF+4®
Petro-Canada ATF+4®
Quaker State ATF+4®
Ravenol ATF+4®
Sinopec ATF+4®
Super Tech ATF+4®
Texamatic DC ATF+4®
Ultramax ATF+4®
Valvoline ATF+4®
I'm sticking with Mopar ATF4+ from now on.