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.
In 9 months I made put 25K km (17K in miles) and everything is perfect. I've been to a few long trips, it's such a fun to drive this car at these long trips - this is where it's a its best. Gas mileage is a bit on the high side, especially at winter, but hey, you can't have everything. I'm a bit worried reading all the bad reliability reviews for 2007 that I decided to write this one. So far, I love this car.
I saw no review about the VVT problem that is part of the CX7. This can be a very serious problem. To having the entire engine replaced. Symptoms: engine makes ticking/clacking noise when running and loud snap upon start up. My first trip to dealership was brushed off. Second trip, doing repairs.
Nothing but problems. Two weeks after purchase looked under the car to see what the exhaust looked like the car all I saw was rust from the front to the back I was very disappointed when I buy a new car I expected a new car. Took it in for inspection a few months later and rotors needed cut and brake pads had to have rust sanded ( come on just replace them) then at 6000 miles all my electronics shut down everything went off TCS radio blue tooth navigation gas gauge would float from empty to full I have no idea probably rusted somewhere in the components sound like electrical???? Will they ever figure it out?? I got ride of the car happiest day ever took my loss and bought a Nissan again.
Cx7 looks great but made very poorly once problem starts they don't stop Check engine light on since day 3 got everything fixed o2 sensor, coils plugs mount, and much more. Cd player stop working engine eceleration went poor transmission got messed up 8 months later check engine light still on. White smoke on exhaust when left idle for 3 minutes, lease it and return don't buys if it has more then 50,000 miles