What viscosity is recommend for motorcycles?

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.

What are the beta ratios?

Average beta rating based on ISO 4548-12 multi-pass test methods: B100 = 25 (at 25 or greater micron, media is 99% efficient.) B75 = 20 (at 20 or greater micron, media is 98.7% efficient. Also considered absolute rating.) B5 = 10 (at 10 micron or greater, media is 80% efficient.)

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