TW> That is corect. A 10W-30 is the same as a 10 weight when it is cold but
TW> the oil changes as it warms up to the equilivent of a 30 weight when
TW> hot.
TW> Here in SAn Diego California where the weather is fairly mild
TW> I had been running 20-50 oil in my cars.
TW> 
TW> I have recently changed to using a full symthetic and will be using the
TW> 10-40 in my older truck with a little over 100,000 miles on it.
TW> 
TW> Becasue of the increased gas miledge helps then meet the CAFE standard
TW> most car manfacturers recommend the 5-30 or 0-20 in their new cars

Thanks for validating that for me.  I never knew about the additive that
makes the weight different in cold/hot conditions.  I just knew the higher
numbers meant "thicker".

All I know is that cold start value tap that lasts for about 20-30 seconds
happens more often and louder when we have cold weather.  On hot days, it
doesn't do it much if at all. 

- Mark

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