Re: Re[2]: [ST] Mobil 1 15W-50 SuperSyn Oil

["Rick & Joyce" <rnjwes@xxxxxxxxxxx>]

FWIW, the current-technology synthetic diesel oils (Rotella-T, Delo
400, Mobil Delvac) are 5w-40 to meet the requirements of the CH-4,
CI-4, etc. ratings for low and reduced sulfer fuel applications.
These are specified by the engine manufacturers of most major truck
engines as well as MB, VW and others

Triumph's concern here may be the spread between the cold viscosity
number and the hot.  I think that's why they caution us to avoid
10w-50.  I recall reading that the viscosity improvers needed to
achieve that spread may somehow compromise overall performance.  Sorry
I don't have the correct nomenclature.

When using a 5w, engine tolerances may be the issue.  My understanding
is that our engines don't run clearances as close as some Japanese
engines.

It is also my opinion that the 10w-40 synthetic will provide more than
adequate lubrication in most 'cold' conditions, where its still warm
enough for mortals to ride.
YMMV,
Rick in Oregon
'01 Sprint ST



> That has been my conclusion as well.  I recently switched from the
> Rotella T dino to the synthetic in my Kawasaki, and was only able to
> find 5W40.  I searched several retailers...
>
> Dan
>
> >>> sobiloff@xxxxxxxxxxxxxx 8/10/2004 10:55:30 AM >>>
> >From: Keith Winter <keith_winter@xxxxxxxxxxx>
> >Subject: Re[2]: [ST] Mobil 1 15W-50 SuperSyn Oil
> >
> >Blake, I'm curious: why do you want to drop to such a low
> >viscosity oil?
>
> The Shell Rotella T  Synthetic only comes in a 5W-40 (at least, that
> Wal-Mart carries).  Using 15W-50 always bothered me a little, as I
tend
> to ride year-round and encounter some pretty cold temps in the
winter
> time that 15W isn't appropriate for.  The 5W rating is simply going
to
> make cold startup a little easier; once the oil is warm it'll act
just
> like any other 40W oil.
> --
> Blake Sobiloff
> San Mateo, CA
>
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