OUR SATISFIED CUSTOMERS ![]() Hi Royal Purple Hawaii, I wanted you to know what a difference Royal Purple products have made for my 2006 Ford Mustang GT. I first started with the the 5W30 engine oil. Immediately I noticed more horsepower and it feels like my engine runs at optimum performance. Then I changed the differential fluid out to threR.P. Max Gear 85W-140 and again have noticed the RPM's are slightly lower when the transmission shifts through the gears. The latest thing I did was change out the transmission fluid to the H.F. ATF (Royal Purple Industrial Transmition oil) fluid and I can't believe the results. I now get 4 - 5 more miles to the gallon!!! This is unbelievable. I never dreamed my V8 would get this kind of gas mileage. I recommend Royal Purple products to anyone that owns a car. Thank you Royal Purple Hawaii
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