. API Certified. Sold by quart. 01520 5W20 . . . . . . . . . . . . . . . . .$6.49 ... 01530 5W30 . . . . . . . . . . . . . . . . .$6.49 ... all applications where Ford MERCON and GM DEXRON fluids are specified. 01320 Max ... 1 qt. . . . . . . . . . . . .$8.99 Max Gear Formulated to improve the efficiency of ... rear end assemblies and manual transmissions, Royal Purple's Max-Gear ... slip differentials. 01300 75W90 Max Gear . . . . . . . . . . . . . .$9.69 01301 ... 75W140 Max Gear . . . . . . . . . . . . .$9.69 01303 ... 85W140 Max Gear . . . . . . . . . . . . .$9.69 Purple ... 89 01011 Race 11 Viscosity Typical of a 5W20 . . . .$11.89 01021 Race 21 Viscosity ... Typical of a 5W30 . . . .$11.89 01041 Race 41 Viscosity ... of a 10W40 . . .$11.89 01051 Race 51 Viscosity Typical of a 20W50 . . .$11. ...