The engine oil capacity for most Honda TRX300 4x4 models is roughly 1.6 to 1.8 quarts (1.5 to 1.7 liters) for a full change with a new filter. Some years share oil with the transmission, and capacities can vary by model year, so check your manual for the exact figure.
Oil capacity by system
Here are the typical oil capacities you’ll encounter when servicing a TRX300 4x4. Use these as a guide and verify with the specific year and service manual.
- Engine oil capacity (with filter): 1.6–1.8 qt (1.5–1.7 L)
- Transmission/gear oil capacity (if a separate fill): 0.6–0.7 qt (0.6–0.7 L)
Note that some models use the same oil for engine and transmission and may not have a separate gear oil fill. Always consult the exact owner's or service manual for your year to avoid over- or under-filling.
Practical reminders
When performing an oil change, ensure you use the manufacturer-recommended oil type and viscosity for your year, replace the filter, run the engine briefly to circulate oil, and recheck the oil level with the dipstick or sight glass after it settles.
Summary
For most TRX300 4x4 models, plan on about 1.6–1.8 quarts (1.5–1.7 liters) of engine oil per change, with an additional 0.6–0.7 quart (0.6–0.7 liter) if your model has a separate transmission/gear oil fill. Always verify exact capacities against your specific model year’s manual to ensure accuracy.