Mineral oils, derived directly from crude oil, are the most affordable option and work well for older, low-mileage bikes or those used in mild climates. JASO MA certified oils are formulated to provide the necessary friction for the clutch to engage positively while still protecting the engine.
Troubleshooting Common Harley Oil Problems and Solutions
Others prioritize racing performance, with additives that reduce wear on the big end and cylinder walls during high-RPM operation. Some oils are designed to enhance the legendary Harley rumble by adjusting the friction characteristics slightly to improve clutch modulation.
The Society of Automotive Engineers (SAE) viscosity rating, such as 20W-50 or 10W-60, indicates how the oil flows at different temperatures. Choosing the wrong viscosity can lead to poor lubrication, increased wear, or difficulty in starting the engine.
Troubleshooting Common Harley Oil Problems and Solutions
The clutch on a Harley is bathed in the same oil as the engine, and standard automotive oils contain friction modifiers designed to reduce internal engine friction. Some oils are designed to enhance the legendary Harley rumble by adjusting the friction characteristics slightly to improve clutch modulation.
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