2009 Mazda CX-7 Sport 4dr SUV AWD (2.3L 4cyl Turbo 6A)
Our Mazda CX-7, with 57,000 miles on it, experienced the same sludge build up resulting in a turbo blowing out, timing chain stretching and VVT needing replacement, as thousands of other CX-7 owners have also experienced. With the original warranty and extended warranty still in place, Mazda denied all service claims stating "poor vehicle maintenance"--as they have with all the other CX-7 owners.
In speaking with Mazda technicians, they stated to me that there is a problem with the oil cooled turbo that Mazda refuses to admit to because it will result in a huge recall.
Mazda needs to be held accountable for their poor design on these cars and stop putting the blame on consumers.