“On September 12, Mustang Motorsports …completed a performance tune on my 2005 Mustang GT. …The car was running on Mobil 1® and the balance of the drivetrain fluids were factory installed. …The DYNOmite report showed maximum horsepower to be 290.3. The car had 10,500 miles.

On October 5, Mustang Motorsports installed the following Royal Purple products: Engine - [XPR 5W20]; Transmission - Synchromax; Differential - Max-Gear 75W140. Upon completion another pull was made on the same dyno. …The car pulled 300 horsepower (+10 hp). Also please note the car produced over 330 ft. / lbs. of torque before 3000 RPM as opposed to 4000 RPM. NO OTHER MODIFICATIONS WERE MADE TO THE CAR. This stuff works! Thank you.”

—William C. Grant, Fort Meyers, FL

“I purchased your Synchromax trans fluid today. I own a 2005 Silverado with a 5-speed manual transmission. … I’d like to say ‘Wow!’. Not even when new (20,000 miles ago) has my truck shifted and run better. …I had heard great things about Royal Purple from members on ChevyTruckWorld and decided to try it.

I’m glad I did — it really is ‘The Oil that Outperforms’. …Thank you for creating a product worthy of its reputation.”

—John Cook, member ChevyTruckWorld.com