RE: [ST] Why Synthetic Oil?

["colt4530@xxxxxxxxxxx" <colt4530@xxxxxxxxxxx>]

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.

Original Message:
- -----------------
From: Bird, Garry BIRD@xxxxxxx


Here's an observation...I had a few oil analysis' done on my Sprint ST oil
and my friend did the same on his Daytona.  I ran 20w50 Amsoil and he ran
10w40 Amsoil.  What we both noticed is that when we had our analysis' done
at 6000 kilometres (~3600 miles) both oils exhibited a viscosity drop of 10
points.  That is to say the 20w50 was testing out at operating temperature
(I think 212 deg F) at a viscosity of 40.  Same for the 10w40...it was
testing out at a viscosity of 30.  Needless to say we were only running our
oils to 6000 kms since we didn't want to run our oil out of
spec...especially the 10w40.

So, maybe with all of the gear shearing of the oil, the synthetics stand up
better during Triumphs recommended oil service life.

Just maybe...


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