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I purchased a ford F150 2007 brand new from a ford dealer with 5.4 engine its now April 2014 while driving my truck I hear a knocking noise in the engine so I took to the dealer to have it check I was told the that the engine is bad you need to replacd the engine the and truck only has 41000 miles , I also was told that these trucks have defected engines. I never saw a check engine light come on or the oil gauges show low oil ..The ford dealer said the oil presure does not hold. It sad I call ford corporation to see why they have not recall engines , ford open a file but it does not good .