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?
 
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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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Aug 28, 2006
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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.
 
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Probably no fiction modifiers and other additives that work well in cars but mess up a wet clutch maybe?
 
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