Yamaha XMAX 300 Gear Oil Capacity
The Short Answer
The Yamaha XMAX 300 final transmission is commonly listed in Yamaha owner's manuals as taking 0.25 L of gear oil, which is about 0.26 US quarts or 0.22 Imperial quarts. No source documents were supplied for this article, so treat this figure as a reference point and confirm it against the owner's manual or service manual for your scooter's model year and market before you refill.
What "Gear Oil" Means on This Scooter
On the XMAX 300, gear oil refers to the oil in the final transmission, sometimes called the final drive or gearbox. This is a small sealed gear case at the rear wheel. It is separate from the engine oil. The two systems have different capacities and may call for different oils, so a figure for one does not apply to the other.
Scope and Qualifications
The 0.25 L figure is associated with the XMAX 300 sold from the 2017 model year onward. Whether later updates, including the revised XMAX 300 introduced for the 2023 model year in some markets, kept exactly the same capacity is not confirmed here. Check the manual for your specific year. The figure applies only to the XMAX 300. The XMAX 125, XMAX 250 and XMAX 400 are different machines, and their final transmission capacities should not be assumed to match. Market-specific versions, such as European, North American and Asian models, can differ in specifications and recommended oils. Use the documentation for your region.
Oil Type
Yamaha's manuals for this model are generally reported to call for a gear oil of a specified viscosity and service classification. Those requirements can vary by market, and they were not confirmed in supplied evidence. Use the oil grade printed in your owner's manual rather than relying on general guidance.
Practical Next Step
Before draining the final transmission, have the owner's manual or a model-specific service manual on hand. It will confirm the capacity, the oil grade, the drain and filler bolt locations, and the tightening torques, none of which are covered in detail here. Because the case holds only a small amount of oil, measure the new oil rather than pouring directly from the bottle. Overfilling or underfilling by even a modest volume is a large share of the total.