M1 15-50/v-twin20-50 and stp oil treatment

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Originally posted by RoadKingRider:
I'm just stuck on that viscosity span and possible shearing with 15W50 over 20W50. It's like switching from a full bodied beer to a lite beer , it's just not the same. Can anyone possibly put my mind to ease with that issue?

I just posted a UOA on my bike using 15w50 (in the UOA section). So far, the oil is holding up well with minimal shear down and still is in service.
 
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