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Thanks Texas. Prior to your reply I dumped the oil and spent the $$$ to recharge with fresh Amsoil 5w30 and filter. I will test in 5500 miles. UCC

Based upon these results should I change the oil? Or just the filter? Engine 2004 6.0 Navistar PSD Type of oil Amsoil 3000 5w30 MI/HR ON OIL 5,452 MI/HR ON UNIT 10,278 ALUMINUM 3 CHROMIUM 2 IRON 47 COPPER 21 LEAD 4 TIN 2 MOLYBDENUM 1 NICKEL 0 MANGANESE 0 SILVER 0 TITANIUM 0...