Yamaha 01 and Yamaha S1

What is the difference between Yamaha 01 and S1 susp oil, I've been using 01 in my '06 YZ450 but it calls for S1.

S1 is a lower viscosity.  Both of them are too expensive, and neither one holds up very well.  I would use Amsoil Shock Therapy or another major brand, top tier suspension fluid instead. 

S1 is a lower viscosity.  Both of them are too expensive, and neither one holds up very well.  I would use Amsoil Shock Therapy or another major brand, top tier suspension fluid instead. 

Thanks

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