2004 Ford F-250 Super Duty 2dr Regular Cab XL Rwd LB (5.4L 8cyl 6M)
Purchased with about 18k miles, ran well up to 2009 - started blowing oil filter off(and all engine oil out) - thought I had put filter on wrong - happened again and this time burned up turbo - Spoke with a mechanic - manufacturer of engine put faulty head bolts on engine - head started lifting up and pressure backs up into the cooling and oil systems - had it repaired (new head bolts, head gaskets, oil cooler, turbo and bypassed egr) now runs great.
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