How to Verify a JASO MA2 Claim on a Supplier’s Document
Last verified: 2026-07-27
A JASO MA2 claim rests on self-declaration. The supplier files its own test data with the JASO Engine Oil Standards Implementation Panel, which does not verify performance itself. You can confirm a filing exists, and confirm it down to the individual product — but no public record proves the drum in front of you matches it.
Our certifications and approvals guide covers the broader point: this is a filing system, not a testing laboratory. This episode stays narrower — what a genuine filed entry looks like field by field, and three ways a JASO claim can look legitimate and still fail.
What the claim rests on
JASO T903 is issued by JSAE, the Society of Automotive Engineers of Japan. A separate body, the JASO Engine Oil Standards Implementation Panel, administers the filing and publishes the results at jalos.or.jp.
Its own implementation manual states that an oil "is classified and guaranteed based upon the judgment and responsibility of the company... which submitted the specified notification documents for filing," and that the Panel "does not guarantee the quality or performance of the oil, and takes no responsibility with regard to such matters." Original test reports stay with the submitter. The Panel does run market surveys — randomly sampling filed oils and checking both the marking and the quality and performance items against the on-file documents — but these are occasional spot checks, not a systematic re-test of every filed product.
A filing therefore proves a complete self-certified dossier exists on public record. It does not prove a given batch matches it.
Where to check it
The Panel publishes the Filed Motorcycle Four Cycle Gasoline Engine Oil List as a public PDF. The edition read for this piece is dated 1 July 2026 and carries over 2,600 entries across five columns: Brand Name, Submitter Name, Oil Code, Performance classifications, Viscosity Grade.
Anchor on the Oil Code. It identifies one specific product rather than a brand, and its structure is defined in the implementation manual, not merely observed:
- a class letter — M for motorcycle four-cycle oils;
- three digits — the ITU calling code of the submitter or manufacturer's country;
- three letters — the supplier's assigned code;
- three digits — a control number the submitter chooses and does not reuse.
Those middle three digits are worth reading closely. A country code embedded in the Oil Code that does not match the country of manufacture you were quoted is not proof of anything, but it is a question worth asking before you order. One caution: a handful of rows on the current list repeat verbatim, so read an Oil Code match across the Brand Name and Submitter Name fields too, rather than treating a single matching row as the whole answer.
What looks right but isn't
- A free-text claim with no matching row. "Meets or exceeds JASO MA2" printed on a label or data sheet passes through no check before it is printed.
- An MA1 claim. MA1 is a real class in the standard, but no product on the current filed list carries it — so an MA1 claim cannot be matched against the register at all.
- Class overstatement or edition drift. A product filed as MA or MB marketed as MA2; or a claim resting on a closed filing window. New T903:2016 applications ended 30 September 2023 and those filings expire 30 April 2028, with T903:2023 container marking allowed from 1 October 2023. A document citing the 2016 edition is not automatically wrong, but it cannot be a new filing.
What to ask for in writing
Please confirm, as they appear on the current filed motorcycle four-cycle oil list: the exact Brand Name, Submitter Name and Oil Code for this product; the JASO T903 edition it is filed under; and a photograph of the container marking showing the classification as filed. We will check the Oil Code against the published list before proceeding.
For the grade family itself, see the motorcycle oils guide; suppliers listing these grades can be reached through the motorcycle oils category, where this request belongs in the quotation itself.