05 May 12 08:34, Mark Hofmann wrote to Tom Walker:



 TW>> That is corect. A 10W-30 is the same as a 10 weight when it is cold
 TW>> but the oil changes as it warms up to the equilivent of a 30 weight
 TW>> when hot. Here in SAn Diego California where the weather is fairly
 TW>> mild 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
 TW>> the 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
 TW>> standard most car manfacturers recommend the 5-30 or 0-20 in their
 TW>> new cars

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

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

8^) That's because on warm days, the oil's viscosity is thicker...


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