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RE: [ST] Why Synthetic Oil?



> > I think you are correct!  That would explain the prohibition of 0W
and
> 5W
> > oils as well as 10W-50 oils.  The viscosity modifiers are the first
to
> > breakdown.
> 
> Certainly! If 50W dropped 10 points to 40W and 40W dropped 10 points
> then it stands to reason that 5W would drop to -5W and 0W would drop
to
> -10W! YIKES! I certainly don't want to find out what occurs when that
> happens!

I am taking my bike to a indie shop tomorrow. One of the things they are
doing is an oil change. For synthetic they use castrol. Castrol R4 only
comes in 5W-40.

Are you saying this is not suitable for my 99 ST?
Rupert



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