“I first tried your gear oil in my [manual] transmission and then in the differential. I progressed to the engine oil, changed the filter and went on a 1,000 mile trip.

…I could not believe what I was feeling and how smooth everything became. My mileage went up enough for me to see the difference on the gas gauge, and I felt better performance from the motor.

The transmission shifted better, and I actually believe the vehicle rolls along easier. My Toyota Tacoma has never run like this in all the years that I have had it. Thanks.”

—John Martinez, Apple Valley, CA

“I used Royal Purple Max-Gear 75W140 in a story that I just completed for 5.0 NUSTANG AND SUPER FORDS. The story is about upgrading the front and rear brakes on a 2002 Mustang. The upgrade requires removing the rear axles so the differential cover had to be removed and cleaned.

…There is a marked, smooth difference between the Royal Purple and whatever gear oil was used by Ford. Very smooth.”

—KJ Jones, Technical Editor, 5.0 Mustang & Super Fords magazine