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Message: [QUOTE="TyCorr, post: 428096, member: 1451"] I ran motorcraft 15w40 in my current 7.3 for about 50k miles. No issues. But I changed it every 3k. Back to the OP, I've used Mobil1 "turbodiesel" 5w40. I got it for 19.99/gal on sale at oreillyauto. It retails there for 29.99. I don't find the valvoline extreme blue to be any better. I ran that for 20k and switched to the valvoline because everyone sad how great it was. Aside from the cold startup benefits during winter I don't know how great syn is. Sounds like you got it handled by though! [/QUOTE]

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