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Re: Re[2]: [ST] Mobil 1 15W-50 SuperSyn Oil
Generally, the viscosity index (VI) improvers used to reach 40, from 5W are
not high temperature stable and are easily sheared by gear teeth. That
turns a 40 weight oil into a 10 or 20 weight oil pretty quickly. Since
Triumph allows a 6000 mile oil change, they don't want 5W-40 in the
crankcase that long during the warranty. They must not want to include a
complex oil change table or do the testing required to establish it.
Original Message:
- -----------------
From: Rick & Joyce rnjwes@xxxxxxxxxxx
Date: Tue, 10 Aug 2004 13:14:23 -0700
To: ST@xxxxxxxxxxxxxx
Subject: Re: Re[2]: [ST] Mobil 1 15W-50 SuperSyn Oil
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.
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