“WHY SOME PASSENGER CAR MOTOR OILS ARE NO LONGER SUITABLE FOR MOTORCYCLES: GEAR PITTING ISSUES”
Starts on page 12.
https://hrcak.srce.hr/file/9883
“SUMMARY
While there is a constant push to develop more fuel efficient oils for passenger car applications, these same oils become less suitable for motorcycle applications. It is known that highly friction modified oils developed to enhance fuel economy in passenger car engines can cause clutch slippage. It is also known that oils of viscosity grades lower than 10W-30 can cause gear pitting issues when used in motorcycles. This paper demonstrates that even 10W-30 oils developed for passenger car applications may cause gear pitting issues when motorcycles are run under heavy load severe service conditions. Today’s 10W-30 engine oils formulated for passenger car applications are typically formulated with non-shear stable viscosity modifiers. In motorcycle engines, however, shear thinning of the viscosity modifier combined with low viscosity and low phosphorus oils may lead to gear pitting issues under severe service conditions as demonstrated in this paper.”
Starts on page 12.
https://hrcak.srce.hr/file/9883
“SUMMARY
While there is a constant push to develop more fuel efficient oils for passenger car applications, these same oils become less suitable for motorcycle applications. It is known that highly friction modified oils developed to enhance fuel economy in passenger car engines can cause clutch slippage. It is also known that oils of viscosity grades lower than 10W-30 can cause gear pitting issues when used in motorcycles. This paper demonstrates that even 10W-30 oils developed for passenger car applications may cause gear pitting issues when motorcycles are run under heavy load severe service conditions. Today’s 10W-30 engine oils formulated for passenger car applications are typically formulated with non-shear stable viscosity modifiers. In motorcycle engines, however, shear thinning of the viscosity modifier combined with low viscosity and low phosphorus oils may lead to gear pitting issues under severe service conditions as demonstrated in this paper.”