What viscosity is recommend for motorcycles?

What are the beta ratios?
August 17, 2018
How many miles can I go between oil changes?
August 17, 2018
Follow the manufacturer’s recommendations regarding viscosity. Most manufacturers recommend a 10W-40 for 4-cycle, liquid-cooled motorcycles. Air / oil cooled motorcycles typically specify a 20W-50. Check your owner’s manual for verification or contact Royal Purple’s Automotive Technical Department at 888-382-6300 for assistance.
Category: Motorcycle Oils