The 2015 Honda Rubicon 500 uses two separate lubricants: engine oil for the motor and gear oil for the transmission/final drive. The engine takes 10W-40 oil, while the transmission/final drive requires 80W-90 gear oil.
For best results, use oils that meet Honda’s specifications and consult the owner’s manual for exact fill levels and service intervals. Commonly recommended choices are Honda GN4 10W-40 for the engine and a GL-4/GL-5 80W-90 gear oil for the gearbox, but you can also use suitable equivalents from reputable brands in conventional or synthetic form depending on climate and riding conditions. Capacities vary by year and specific model variant, so verify the exact amounts in your manual before draining or refilling.
Oil types and capacities
This section explains the kinds of oil you’ll use and where capacity applies for a 2015 Rubicon 500. The two oil systems—the engine and the transmission/drive—have separate fills.
- Engine oil: 10W-40, API SG/SH or higher. Honda GN4 10W-40 is a commonly cited option; both conventional and synthetic formulas are acceptable as long as they meet the spec.
- Transmission/Final Drive oil: 80W-90 GL-4 or GL-5 gear oil. This is separate from the engine oil and should be filled to the level specified in the service manual.
In short, the Rubicon 500 requires 10W-40 engine oil and 80W-90 gear oil for the transmission/final drive. Always check your specific manual for exact capacities and intervals.
Summary
The 2015 Honda Rubicon 500 uses 10W-40 engine oil and 80W-90 GL-4/GL-5 gear oil for the transmission and final drive. Choose oils that meet Honda specifications (e.g., GN4 10W-40 for the engine) and confirm exact fill quantities in the owner’s manual. Regular maintenance should follow the manual’s guidance to keep the ATV running smoothly.