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Message: [QUOTE="CATDiezel, post: 1088250, member: 4387"] The grocery oil (lol) is intended for short burst runs when the truck never reaches operating temp. Or cruising. It's still 40 weight oil at 212*F. BUT the additives that make the oil viscosity (the 5w) runs out and is much less affective at higher temps. That's why they raise the additive to 15w-- remember it's still 40. It sustains lubricity in a higher temp value. However. It has an opposite side affect and that is cold weather. For a dedicated drag truck your best off with a 0w-30. With a optimum oil cooler. Full synthetic. I wish I was sitting at my desk so I could make this not such a scatter brained reply!! [/QUOTE]

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