In most cases, the 400cc Hondas use motorcycle-grade oil around 10W-40 with JASO MA or API SN specifications, but the exact grade and capacity depend on the model and year. Check the owner's manual for your specific bike to be sure.
Identify your exact model and year
Because Honda produced multiple 400cc lines—CB/CBF road bikes like the CB400 Super Four, dirt bikes such as the XR400R, and dual-sport/enduro models like the CRF400X—the oil specification can differ. Locate your model code (for example, CB400 Super Four NC31/NC42, XR400R, CRF400X) and year, then consult the manual or Honda’s official service portal for the precise grade, capacity, and specs.
Below are general guidelines for common 400-class Hondas. Read with caution and verify with your manual.
Common oil grades you may encounter on Honda 400s
These are typical oil grades you might see recommended across various 400cc Honda models. The exact grade for your bike may vary; verify with the manual.
- 10W-40 motorcycle oil that meets JASO MA (for wet-clutch bikes) or API SN/SJ/SL specifications. This is the most common recommendation across many CB/XR/CRF 400-series bikes.
- 10W-30 or 5W-40 for specific models or climates where a thinner oil is preferred; always confirm that the chosen viscosity is approved in your manual and by Honda for your bike.
- Mineral oils and synthetic blends are typically acceptable; full synthetic oils are common on newer bikes, but some older models perform best with mineral or mineral-blend oils, per the manual.
In practice, the exact choice should match the model-year-speced grade and be compatible with a wet-clutch system and the engine design. Always avoid automotive engine oils not intended for motorcycles unless the manual permits it.
How to determine the exact oil for your Honda 400
Follow these steps to confirm the precise oil grade, capacity, and any special requirements for your bike.
- Find your exact model code and year (e.g., CB400 Super Four NC31, XR400R, CRF400X).
- Consult the owner's manual or Honda's official service portal for the recommended oil viscosity, oil type (mineral vs synthetic), and required specifications (JASO, API).
- Check the oil capacity and whether a filter change is included in the service interval. Use the manual's fill quantity and procedure.
- Choose an oil that meets the specified standards and suits your climate and riding style (and verify that it is appropriate for a wet-clutch system).
- If unsure, contact a Honda dealer or a qualified motorcycle mechanic for model-specific guidance.
Using the correct oil helps ensure reliable performance and longevity across conditions.
Summary
The Honda 400cc family covers several distinct models, each with its own lubrication requirements. The most common general guideline is to use a motorcycle-specific 10W-40 engine oil that meets JASO MA or API SN, but always verify the exact grade, capacity, and any model-specific notes in the owner's manual or Honda's official resources. When in doubt, consult a dealer or service manual to confirm your bike's requirements. Regular oil changes and proper clutch compatibility are key to long-term reliability.
How much oil does a Honda 400 hold?
NOTE: The Honda TRX 400 uses 1.9 quarts of oil. Before filling it up, check the capacity of the engine, and keep in mind that all of the oil will probably not go in at once.
Can I use regular 10W30 in my ATV?
The engines are machined so that the chosen viscosity is most effective. In the example recommendation above, the manufacturer requires grade 10w30, so depending on the start temperature, 0W30, 5W30 or 10W30 would be good choices.
What kind of oil does a Honda 400 take?
Here. And the oil filter is located on the right hand.
Can I put 5W-30 oil in a Honda?
Systems honda is very specific about oil viscosity requirements most modern Honda engines call for 0W20. Oil some older models use 5W30. These aren't suggestions their engineered requirements.