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Message: [QUOTE="Rooster350, post: 1555778, member: 34032"] Racer71 i definitely agree about more worry then what it really is. I think what really messes me up is when I get parts at the ford counter and ask them for a oil service kit and they pull 5w-40 and say this is what’s recommended but I look at the service receiot on my work truck and the tech put in 15w-40 so I ask the guy at the counter and he’s like oh I dunno why they did that. Hahaha I just go on about my way and notice nothing different with the 15w-40 in my work 6.7 and the 10w-30 in my personal 6.7. Both 17 models. Ones a 550 and the other is a 350. Same dam truck just different tune. [/QUOTE]

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