I was checking my owner's manual & it has that generic temperature to oil viscosity chart. If the 10 is the "cold" weight and the 30 is the "hot" weight, then why is 10w30 recommended for warm weather and 5w30 is not? It seems to me that they should be the same as far as heat is concerned. Do I have it backwards? Rob _________________________________________________________________ Join the world’s largest e-mail service with MSN Hotmail. http://www.hotmail.com