Motorcycle oil in a Car?

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Pay attention on specs as.... GL4+ or GL4/5 or GL5 / MT-1

These are all "GL5" oils with chemistry adapted for GL4 gearbox
 
The Castrol Power RS is API SL/JASO-MA2. The old Honda spec was API-SG.

JASO-MA2 – This specification was introduced in 2006 for modern motorcycle engines. As well as being a higher standard of oil the JASO-MA2 approval means the oil is suitable for use in bikes with catalytic converts in the exhaust system.

I have always run thick 30wt oil (GC) now I use the 0-40wt EDGE.

I think I will be fine since I only have about 20 Quarts to run thru and I was planning on a new Cat and better 02 sensor before my next smog check.
 
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