 We bought a Certified CX7 2008. A year and a half later the car is completely giving out. We take MAJOR care of all our cars with Synthetic Oil, so when they told us it was due to "Sludge" it was definitely a slap in the face. The engine needs to be replaced at only 70k miles. We talked to a mechanic and he told us that the turbo overhearts the engine turning everything into sludge and even melting it. Although we have a platinum coverage, the insurance is doing everything they can to blame it on us. I've been looking at reviews and it seems ALOT of you are having or had the same issues! It's horrible to keep paying for a car whose engine dies of its own malfunction. Its time Mazda owns up!