[Terry, NJ]

MMO and ATF look the same but are chemically different. How many times has MMO been accused of making a profit by rebottling ATF and adding wintergreen to cover the smell of it? MMO is a solvent while ATF is a lubricant. MMO was developed in 1923, ATF hit the market in 1937 with Buick's automatic Transmission. MMO and ATF will do pretty much the same jobs and about equally well in your upper cylinder. MMO just smells better!
Terry