“I replaced the Mobil1 transmission oil in my 2001 Ford Powerstroke automatic transmission with Max-ATF and the tranny ran cooler by about 20 degrees through the mountains (179-190 degrees, previously it would get to 210).

Engine exhaust temperatures dropped 100-150 degrees (now 800-850 degrees, previously 950-1,000) when towing the 5th wheel, which weighs about 11,000 lbs. and is 32 ft. long, and gas mileage improved 2 mpg.”

—Robert D., Richardson, TX

“Royal Purple is the best stuff I have ever used in my company car!

I recently drained the transmission fluid and put in Max-ATF. There was an immediate, positive difference in the shifting.

There is now Purple Ice in the cooling system. Great products ya’ll! I ordered Max-EZ online today. This car is gonna be completely Royal Purple!”

—George H. Ericksen, Houston, TX