Originally Posted By: Donald
Forget MMO. If your transmission needs cleaning use Auto-Rx. The only mystery about MMO is why so many people continue to use it.
Uuuhhh, because it works!
MMO's base oil is the same as ATF (per Rick Kelly, Marvel Technical Director) so it is very compatible, but the additive package is different - geared towards Cleaning, AW, and Friction Reduction.
It is recommended in ATF's at 16 oz to help clean up any sludge, but primarily varnishes.