Good quality grade 8 and nothing less! I get mine from the local CAT dealer.
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the  1997 F-350 XLT 7.3L PSD 4x4 CC LB BTS E40D Manual Hubs 4.10 36000 miles when purchased 4/1/06. Mods - ISSPRO Performax gauges, Tymar intake, Tymar 3x4 DP to 4" ss exhaust, electric fuel, CCV mod, tru-cool 4739, Swamps 175/30% injectors, stage I Stealth pump, D66 turbo  Spearco 6.0 cac, BDP live tuned tuned 442hp/860tq.
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