RW>I learned the other day that semi-diesels use gallons, rather than quarts   
   RW>of oil. And that oil will go pretty far because of the same tecniques you   
   RW>describe above.   
      
   And that is why partialy how they can run at 100% power a lot of the   
   time. The oil does a lot of the cooling of the engine. Particulalry the   
   piston that takes a lot of heat. Adn most Heavy duty Diesel engines have   
   jets for oil that shoots up inside the piston to cool the crown   
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