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Message: [QUOTE="CATDiezel, post: 1089135, member: 4387"] 5w-40 has a thicker punch per stroke at 32*F than 10w-30 does. Severe duty it still holds a very viable TBN and viscosity index at oil change interval. I'd have to write a book to explain this... Google is on your side. Here's the real kicker.... Oil related failures of these engines are extremely extremely rare. Whether your running 30 or 40. 5w or 10w with cold weather viscosity index improvers. There is alot of good info on the Web about this. Might take all night to read it. And alittle explaining from an engineer plus some math. But in the end. RARELY does anybody keep a truck long enough to get into the "are my main bearings ok?" In the life of a truck. [/QUOTE]

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