# JASO (MA, MA2, MB)

> JASO T903 is the Japanese standard that classifies four-stroke motorcycle oils by their compatibility with wet clutches: MA, MA1, MA2 and MB.

- **Also known as:** JASO MA2, JASO MB, JASO T903
- **Turkish term:** JASO (MA, MA2, MB)
- **Category:** [Engine Oils](https://motorsikletparcasi.com/en/category/engine-oils)
- **Page:** https://motorsikletparcasi.com/en/glossary/jaso-oil-standard

- **JASO MA, MA1, MA2:** high-friction oils for motorcycles with wet clutches. MA2 defines the highest friction range.
- **JASO MB:** low-friction oil for some scooters whose clutch does not run in engine oil. It must not be used in wet-clutch engines.

Two-stroke oils use a separate JASO classification (FB, FC, FD). The correct class is given in the owner's manual; the oil container shows the JASO code with a registration number.

## Related terms

- [Engine oil](https://motorsikletparcasi.com/en/glossary/engine-oil): Engine oil lubricates, cools and cleans the engine's moving parts; on most motorcycles it also lubricates the clutch and gearbox.
- [Clutch plates](https://motorsikletparcasi.com/en/glossary/clutch-plates): Clutch plates are the friction-lined discs in a wet multi-plate clutch that clamp against the steel plates to transmit engine power to the gearbox.
- [Clutch](https://motorsikletparcasi.com/en/glossary/clutch): The clutch connects and disconnects drive between the engine and the gearbox under the rider's control.

---

- Source page: https://motorsikletparcasi.com/en/glossary/jaso-oil-standard
- Last updated: 2026-10-09
- Türkçe sürüm: https://motorsikletparcasi.com/sozluk/jaso.md
- Site overview: https://motorsikletparcasi.com/en/llms.txt
- Append .md to the URL of any product, category, motorcycle, brand, blog or company page on this site to get its Markdown version.