Royal Purple lubricants are great!
I have used RP engine, transmission and gear lubricants for the past 10 years without a failure of any type. I use them in my cars, SUV, farm tractors (both gas and diesel) and my go fast boat. I normally run the cars and SUV 10,000 miles between oil changes, however, I change the filter every 2,500 miles. RP also makes racing oil for the pros - NASCAR, marine racers and drag racers. Suggest you visit their website:
www.royalpurple.com. If you want a superior synthetic lubricant with only one additive - RP patented Synerlec - RP is worth looking at. My $.02 worth.
Ed Springer
90 Black XR7 5-speed: 70mm TB, Fresh Air Intake, '94 Supercharger, 5% SC Pulley, Raised SC Top, I/C Fan, Under-drive Pulleys, 190 l/h Fuel Pump, 36# Injectors, Headers, Magnaflow Muffler (no cats) with stock resonators, 3:27 Gears, Ripper Shifter, 73mm CL MAF (Blue Tube), Magnacore Wires, NGK Iridium Plugs, Royal Purple Lubricants and Rear Spring Air Bags.
94 Red SC Auto: 70mm TB, Fresh Air Intake, Stock 90 SC Pulley, Raised SC Top, I/C Fan, Under-drive Pulleys, 190 l/h Fuel Pump, 38# Injectors, Headers, Raven Muffler (no cats) with stock resonators, 3:73 Gears, 76mm CL MAF (Gold Tube), Magnacore Wires, NGK Iridium Plugs, Royal Purple Lubricants, TRANSGO Shift Kit, Pro-Torque 2500 Stall TC, Haydon Auxiliary Transmission Cooler, Tokico Struts & Shocks, American Racing 17” Sniper Wheels, Michelin Pilot Sport A/S Tires and 235 RWHP with 315 LB-FT Torque.