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Message: [QUOTE="wetnsloppy4x, post: 197414, member: 395"] :whs: My truck ran Motocraft 15w-40 for the first 75k miles. Truck seemd to like it. Then I switched to Valvoline Premium Blue 15w-40 for a couple oil changes. There was a HUGE difference (for the better) in how smoothly my truck ran. I then switched to Extreme Blue 5w-40 and it ran even better. I didn't think it could get better than the previous Premium Blue, but it was quite noticable. Oh, and I'll second and third the no go on Schaeffers. MANY reports of this stuff not agreeing with 6.0s. [/QUOTE]

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