JASO Certification FAQs About JASO Certification What is JASO MA oil? JASO MA is a Japanese motorcycle oil standard that ensures proper wet clutch performance and engine protection. What is the difference between JASO MA and MA2? MA2 offers improved friction performance over MA, making it ideal for performance bikes and sport riding. Is JASO MA2 safe for catalytic converters? Yes. JASO MA2 oils are designed to be compatible with modern emissions systems and will not harm catalytic converters. How do I know if oil is JASO certified? Check the back label for the official JASO box marked with MA or MA2. If it’s not labeled, it’s not certified. Can I use JASO MA2 oil in a motorcycle that recommends MA? Yes. JASO MA2 exceeds the performance specs of MA and is fully backward-compatible.