Which Royal Purple Product is Right for You?
4-Cycle Engines2 
RP Motor Oil1
Diesel Engines RP Motor Oil 15W40
Automatic Transmissions make / model specific chart
Power Steering Max EZ
Manual Transmissions2 make / model specific chart
Heavy Duty Manual Transmissions make / model specific chart
Heavy Duty Rear Ends Max-Gear 75W90 & 85W140
Light Duty Rear Ends Max-Gear 75W90
2-Cycle (pre-mix) 2-Cycle TCW III Racing5
2-Cycle (oil-injected) 2-Cycle TCW III
4-Cycle Gas or Diesel RP Motor Oil 15W40, 20W50
Lower Unit / Outdrive Max-Gear 75W90
2-Cycle PWC (pre-mix) 2-Cycle TCW III Racing5
2-Cycle PWC (oil-injected) 2-Cycle TCW III
4-Cycle PWC Max-Cycle3
Street and Off-Road Motorcycles2:
2-Cycle Engines (pre-mix) 2-Cycle TCW III Racing5
2-Cycle Engines (oil-injected) 2-Cycle TCW III
2-Cycle Transmissions Synchromax
4-Cycle Engines Max-Cycle3
4-Cycle Transmissions4 Synchromax
Harley Davidson Evolution and Twin Cam Max-Cycle 20W50
Harley Davidson Evo and TC Transmissions Max-Cycle 20W50
Harley Davidson Primary Tank Max-Cycle 10W30, 10W40, 20W50
Harley Davidson Sportster and Buell Engine Max-Cycle 20W50
Harley Davidson Sportster and Buell Transmissions Max-Cycle 10W30
Chains Max-Chain
High Performance Automotive Drag Racing2:
Import Engines Naturally Aspirated < 7500 RPM XPR 5W20
Import Engines Naturally Aspirated > 7500 RPM XPR 0W106
Import Engines Forced Induction / N20 XPR 10W40
Import Engines Naturally Aspirated Methanol XPR 5W20
Import Engines Forced Induction + Methanol Nitro Plus 50
Domestic Engines - Small Block
- Naturally Aspirated < 7000 RPM XPR 5W30
- Naturally Aspirated > 7000 RPM XPR 5W20, 0W106
- Forced Induction / N20 XPR 10W40, 20W50
- Naturally Aspirated Methanol XPR 5W20, 10W40
- Forced Induction / N20 + Methanol Nitro Plus 60
Domestic Engines - Big Block
- Naturally Aspirated < 7000 RPM Solid Lift XPR 5W20
- Naturally Aspirated < 7000 RPM Hydraulic Lift XPR 5W30
- Naturally Aspirated > 7000 RPM XPR 5W20
- Forced Induction / N20 XPR 20W50
- Naturally Aspirated Methanol XPR 10W40
- Forced Induction / N20 + Methanol Nitro Plus 60
- Nitro Methane Nitro Plus 70, 80
Jr. Dragster Gasoline Engines XPR 0W10
Jr. Dragster Methanol Engines XPR 5W20
Differentials < 800 ft / lb torque Max-Gear 75W90
Differentials > 800 ft / lb torque Max-Gear 75W140
Transmissions G-Force / Liberty Synchromax
Transmissions Powerglide Max ATF
Transmissions C4, C6 Racing ATF
Transmissions TH350, TH400 Max ATF
High Performance Automotive Circle Track / Road Racing 2:
Sprint 360 / 410 Gasoline XPR 5W30
Sprint 360 / 410 Methanol XPR 10W40
Pro Cup / ASA XPR 5W30
Busch / Cup Short Track (e.g. Bristol) XPR 5W30
Busch / Cup Super Speedway (e.g. Talladega) XPR 10W40, 20W50
Busch / Cup Qualifying Racing 2008
Dirt Modified XPR 10W40
Allison Legends / Legacy XPR 5W30
Midgets XPR 5W30, 10W40
Rotary XPR 5W30
Grand AM / SCCA XPR 5W30, 10W40, 20W50
Porsche, air-cooled XPR 20W50
Porsche, liquid-cooled XPR 5W30
Manual Transmissions make / model specific chart
High Performance Motorcycle Drag Racing2:
Import Naturally Aspirated Gas Racing 20086, XPR 0W106
Import Turbo / N20 XPR 5W30, 10W40
Domestic Natually Aspirated Gas XPR 5W20, 5W30
Domestic Turbo / N20 XPR 10W40, 20W50
Domestic Nitro Harley Nitro Plus 50
High Performance Motorcycle Circle Track / Road Racing2:
High Performance Motorcycle Off-Road:
4-Cycle MX / SX XPR 5W20, 5W30
4-Cycle Enduro XPR 10W40
4-Cycle Hare / Hound Scramble XPR 5W30
2-Cycle 2-Cycle TCW III Racing
Transmissions4 Synchromax
- 1 Follow manufacturers recommendations for viscosity. Available in SAE 30, SAE 40, SAE 50, 5W20, 5W30, 5W40, 10W30, 10W40, 15W40 and 20W50.
- 2For more information, please consult Royal Purple’s Automotive Technical Support Department at (888) 382-6300 / (281) 354-8600 or email .
- 3Follow manufacturers recommendations for viscosity. Max-Cycle engine oil is available in 10W30, 10W40 and 20W50.
- 4With separate transmission reservoir.
- 5Follow manufacturer's recommendation for fuel / oil ratio.
- 6Not for street use.
