JASO JWS 3320

JASO JWS 3320 is a Japanese technical standard that defines the requirements for motor oils for gasoline 4‑stroke engines, primarily in motorcycles and high‑revving passenger cars. The specification mandates a minimum viscosity at start‑up and operating temperatures, a high level of wear protection, resistance to oxidation and deposit formation, as well as controlled friction, which ensures smooth operation of wet clutches without slip. Oils that meet JWS 3320 are suitable for direct‑injection, DOHC and multi‑valve engine designs, including modern hybrid and turbocharged units where stability at elevated temperatures is important. Although the standard does not require low SAPS content, it guarantees compatibility with catalysts and DPF systems when required by OEM specifications. XENUM products such as SEMIX 5W40, X1 5W40 or PRO‑DX 5W30, marked JASO JWS 3320, provide reliable protection and long service life for your engine.