I have a Ford with a Triton 5.4.....started running really rough the other day. Engine light came on, started bucking and shaking til finally it felt and sounded like it was running on one cylinder. Check engine light went from solid to blinking now. Manual says, if blinking, its misfiring and to take it to dealer. Had truck towed to dealer. At first it threw over 100+ different codes, indicating injector and coil pack failures. Dealer tells me they will replace the problem injectors and coil packs....should be done by that evening. Get a phone call the evening that I need to come up there right away. Service manager tells me, my engine is sludged up, the sludge wiped out my cam phaser on the #1 bank (driver side cylinders). As explained to me, cam phasers advance and retard your timing according to acceleration/decleration and braking for maximum efficiency and emissions. Sorta like VTEC in Honda engines. Anyway, SM takes me back to show me the sludge build up in my valvetrain and whoa nelly, there sure was. In doing research, these cam phaser have been problematic for FORD, but they dodge a bullet in my truck because of the sludge and quickly pawned it completely off on me. With all this said, at the tune of 3000.00 plus, they're gonna replace both cam phasers but send me up the road with no gaurantee if will repair my truck. The only other option they offered was a completely new engine @ 9000.00. My truck has 70,000 miles on it.....was maintained properly and engine oil chaged at the proper intervals with documentation....however, since I went the cheap way and always had Walmart do it, evidentally, they use inferior Pennzoil oil which broke down due to the complexity of the Tritons specific oil needs, and sludged up my engine. Im telling you all this, because you WILL have issues with your cam phasers. In researching online, they start to fail right about 50,000 miles(average) some sooner, some later.....and if they crack open your engine for them to do so, and its sludged up.....you got nothing to fall back on. This engine NEEDS synthetic...HIGH quality oil at all times and needs to be changed EVERY 3000 miles!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! If your skimping on your oil, like I did.....and you dont have an issue now. Id highly recommend, changing over to a high quality synthetic oil immediately in hopes that it will start cleaning your engine by the time your Triton starts with this issue and it will. Protect you investment, have the dealer change your oil and and let put in what they think it needs as well as a the proper motorcraft filter. So, at 70,000 miles, My 5.4 Triton is toast! P.s., dont try changing your plugs either, let the dealer do it at 180.00. You'll thank me......oh, and there's a customer care recall on the fuel injectors too. They stick open, fill your cylinder with fuel and Hydra-lock your engine. Other than that, I love the truck.