Motorcycle FAQs:
Does Royal Purple offer specific motor oils for motorcycles?
Yes. While the Royal Purple SAE and Racing engine oils may be used in motorcycle applications its Max-Cycle line of engine oils have been formulated specifically for motorcycle engines and transmissions.
Will Royal Purple cause my clutch to slip?
No. Royal Purple provides exceptional film strength for excellent metal-to-metal protection, yet it is also safe for use in wet-clutch applications.
How often do I change Royal Purple in my motorcycle?
While under factory warranty Royal Purple recommends following the manufacturer’s recommended maintenance intervals. In bikes with clean engines that are in sound operating condition, Royal Purple may be used up to 8,000 miles with a filter change every 3,000 to 4,000 miles (top off oil as needed). In motorcycles with high mileage engines, dirty engines or engines otherwise suspect in cleanliness, Royal Purple recommends allowing two to three standard 3,000 mile oil and filter change intervals. This will allow ample time for Royal Purple to gradually remove existing deposits / contaminants without overloading the system (pump, pick-up, filter, etc.). Once these precautionary intervals have been performed, drain intervals may be extended as recommended for clean engines.
What viscosity do you recommend for motorcycles?
Follow the manufacturer’s recommendations regarding viscosity. Most manufacturers recommend a 10W40 for 4-cycle, liquid-cooled motorcycles. Air / oil cooled motorcycles typically specify a 20W50. Check your owner’s manual for verification or contact Royal Purple’s Automotive Technical Department at 888-382-6300 for assistance.
What oil do you recommend for Harley Davidson motorcycles?
For Evolution and Twin Cam motors, Royal Purple’s Max-Cycle 20W50 is recommended. For Sportsters and Buell motorcycles, Royal Purple’s Max-Cycle 10W40 may be used. Check your owner’s manual for verification or contact Royal Purple’s Automotive Technical Department at 888-382-6300.
What do you recommend for the primary tank and transmission?
We recommend Royal Purple Max-Cycle 10W30 motor oil in the primary tank. For Sportster transmission applications, Royal Purple also recommends Max-Cycle 10W30 motor oil.
What product do you recommend for 2-cycle gearboxes?
For motorcycle 2-cycle gearboxes and 4-cycle gearboxes with a separate reservoir, Synchromax manual transmission fluid is recommended.
