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Message: [QUOTE="Joe@Ideal, post: 1089938, member: 12525"] I was thinking the mechanics of rod and main bearing lubrication was a direct comparison. If other oiling considerations in a diesel engine limit your options than so be it. I dunno. Forget the top fuel comparison. Why does Ford require my Shelby to run 5w-50 but a dedicated drag truck under much more stress would be fine with 0w-30? If it is as you said, "Thick oil provides much less protection in high speed moving parts than thin oil. Thin oil is leaving the designed space between the bearing and journal with enough room to allow the nicely heated oil molecules to roll properly", why does everything in the racing world seem to be the opposite logic regarding oils? [/QUOTE]

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