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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