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Re: Anyone using CASTROL Syntec 5w50 oil? (more) (archive)

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Posted by Paul E on May 01, 2000 at 15:53:52:

In Reply to: Re: Anyone using CASTROL Syntec 5w50 oil? (more) posted by Henry on April 30, 2000 at 20:20:37:

: : I'm looking for an oil to replace the BMW labeled 5W40 synthetic oil that has been changed to 5W30.

: : I don't much care for the "30" in the new BMW oil but I'm also not too wild about the "45" spread of the CASTROL 5W50 either. I guess the "45" spread will be okay because the new M5 uses only CASTROL (BMW labeled) 10W60 which has a "50" spread!

: : Any comments bood or bad about the CASTROL 5W50?

: : Bob ///M3


:
: The M5 has the governor to limit rpm's top range when the engine is cold. I think as long as you keep the rpm range low before the car warms up, a wide spread of oil viscosity should pose no problems.

Huh?? The only potential negative effect of a wide viscosity range is that, over time, there will be a tendency to degrade about 5 points off the top end...So that after, perhaps, 10K miles, an oil analysis at the lab may show a 'useful' viscosity of 5W-45 instead of 5W-50. Obviously, this has nothing to do with the dynamic redline the M5 uses due to warm up conditions.


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