Re: [ST] Why Synthetic Oil?

[Mike Montville <mjmontville@xxxxxxxxx>]

Garry,

Thanks for sharing the analysis results!

I switched to 20w50 Amsoil at the last change, almost 3K mi. ago.  Just
about to drain & refill, but I was having second thoughts about using
their 10w40 this time.  Your results seem to indicate staying with the
20w50, to preserve the minimum upper viscosity near oil change time.

Did the analysis reveal anything further?  Will you stay with the heavier
oil during the colder months?

Mike

- --- "Bird, Garry" <BIRD@xxxxxxx> wrote:
> 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...
> 
> __________________
> Garry Bird
> 
> 
> 
> 
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