Compression Ignition Addict
Join Date: Feb 2010
Location: Farmersville/Dayton, Ohio
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I'd say best oil has to be Schaeffers 5-40 full synthetic, but its pricey. Never ran Ford oil, but i've ran regular Rotella, it ran like crap. T6 was slightly better. Non-syn Valvoline ran better than T6, and synthetic Valvoline ran the best. Currently running non-syn valvo, with a case of it waiting to go in the truck. Bought it at TSC for $12 a gallon, i believe its on sale till the end of the month.
For the rear diff you need 75w-140 i believe, and it has to be full synthetic. If your truck has a LSD, you will need friction modifier. But most new gear oils have it already, so you just gotta read the bottle and see what it says. Transmission, t-case, and power-steering pump all take regular ATF.
97 F-250 ECLB 7.3/E4OD/4wd, 216k miles: FFD 250/200%'s, stock turbo, built trans, e-fuel, Swamps IDM, shimmed 910's, Melling LPOP, welded cam gear/modified pick-up tube. Built and tuned by me
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97 F-250 ECSB project truck:250/2's, Gen 3, S468, SD axles, studs/springs, ZF-6