API (American Petroleum Institute) JASO (Japanese Automotive Standards Organization) Does not relate to clutch or transmission performance FIRST LETTER SECOND LETTER “S” for Service (Gasoline Engine Applications) The Rating “C” for Commercial (Diesel Engine Applications) • Further down the alphabet = higher ratings • J is currently most manufacturer’s minimum • Ratings test for: wear resistance, oxidation, corrosion resistance, deposit control and more • Oil must pass all tests to obtain rating MA: Minimum required for engines that share its oil with transmission and clutch • Allows enough friction between your clutch plates for proper operation MB: Not suitable for transmission and wet clutch • JASO MB rating for non-wet clutch motorcycle engines MA2: Highest rating (higher amount of friction within the clutch) • Consistent clutch feel even at high operating temperatures • MA2 advantages: less wear over time and low clutch slip giving your motor more horsepower and torque Most of the Bel-Ray 4-Stroke Powersports line meets or exceeds the API SN standards and are JASO MA2 registered. The few products that don’t meet those standards were formulated to meet specific criteria within the applications for which those products were created. (Example: Bel-Ray Friction Modified Thumper Oil API SN JASO MB was designed for dirt bike engines that used separate oils for the engine and transmission.) Test engine oil for performance, protection and cleanliness Ratings used for engine oil with one oil system for engine, transmission, and wet clutch Engine Oil Ratings Reference Guide TECHNICAL 3
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