Here's why:
* Engine Oil: This is the lubricant that keeps your engine running smoothly. It's typically a conventional or synthetic oil with specific viscosity ratings (like SAE 20W-50).
* Primary Oil: This oil is in the primary chaincase, which houses the primary drive chain and clutch. It needs to be thicker and stickier than engine oil to handle the extreme pressures and heat of the primary drive system.
What type of oil should you use?
* Engine Oil: Consult your 1976 Sportster's owner's manual for the recommended oil type and viscosity.
* Primary Oil: Harley Davidson recommends using their Harley Davidson Primary Chaincase Oil, specifically designed for the purpose.
Important:
* Do not use engine oil in the primary chaincase.
* Do not use primary oil in the engine.
These oils have different chemical compositions and are formulated for different purposes.
Always refer to your owner's manual or consult a qualified Harley Davidson mechanic for the correct oil specifications.
