Shell Advance AX5not good for cars?

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It's SL and JASO MA rated, and apparently has a viscosity of 15W-50. Why does Shell recommended it only for motorcycles but no mention of it being OK for cars? Not enough anti-friction additives because it has to work the wet clutch packs?
 
Shell Advance is the motorbike range

It's an obsolete spec as far as cars go, would be good in historic car engines but no real application for modern cars.
 
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SL is not obsolete. SH and below are.

Originally Posted By: riggaz
It's an obsolete spec as far as cars go, would be good in historic car engines but no real application for modern cars.
 
Probably no fiction modifiers and other additives that work well in cars but mess up a wet clutch maybe?
 
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