The CBR300R uses motorcycle-engine oil rated 10W-30 (or 10W-40 in hot climates) that meets API SN or higher and JASO MA2. A commonly recommended baseline is Honda GN4 10W-30.
For riders, the best choice depends on climate, riding style, and whether you prefer conventional or synthetic oil. The following guide summarizes the approved grades and standards for the CBR300R and how to choose the right product for your bike.
Oil grades and specifications
The correct oil must meet both viscosity grade and performance standards. The following options reflect Honda’s guidance and what is commonly used by owners around the world.
- 10W-30 motorcycle engine oil that meets API SN or higher and JASO MA2. Honda GN4 10W-30 is a widely recommended baseline option.
- 10W-40 motorcycle engine oil that meets API SN or higher and JASO MA2. Suitable for higher ambient temperatures or more demanding use where a thinner oil might degrade sooner.
- Fully synthetic or synthetic-blend 10W-30 or 10W-40 that meets API SN or higher and JASO MA2. Many riders opt for synthetic for enhanced protection and longer drain intervals, as long as it complies with MA2.
These options are compatible with the CBR300R’s wet-clutch system and provide reliable lubrication across a broad range of temperatures. Always confirm compatibility with your local manual or dealer, as formulations can vary by market.
In short, choose a 10W-30 or 10W-40 motorcycle oil that meets API SN or higher and JASO MA2, with Honda GN4 10W-30 being a common starting point.
Summary
For the Honda CBR300R, the standard oil choice is a 10W-30 or 10W-40 motorcycle oil that meets API SN or higher and JASO MA2. Honda’s GN4 10W-30 is a widely recommended option. Always check your owner's manual for the exact specification and capacity, and adjust based on climate and riding conditions.