Hey guys, Just to stir this thread up! Synthetic Oil is also mineral oil. All of their products for cars, are the same Z-max additive for gas, oil and transmission. But, a different bottle and color (a type of dye) for ease of use and marketing characteristics. I've been told that you can use the bottle for the transmission in the fuel or Oil. Just use the appropriate amount. I use the stuff and have no difficulties the tests the FTC used are not necessarily indicative of the inside of your engine or transmission. I get exceptional mileage about 10% greater than the EPA stickers on my cars. This is not a recommendation. Just my opinion!

Roger

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Roger
1983 300CD 246k sold
1998 C230 52k
1980 450SL 75k needs AC
1999 Subaru Outback Ltd 43k