Engine Burning Oil problems of the 2010 Mazda CX-7

On October 4 2012 I was told by the Mazda dealer service dept that my timing chain and turbo charger on my 2010 Mazda cx7 went bad and needed to be replaced. My vehicle only has 39400 miles on it and should be covered under Mazdas power train warranty. I was told by Mazda warranty department that they would not pay for anything based on sludge build up in the engine. I sent them copies of oil change maintenace as they requested which were done at aprox every 3400 miles as apposed to the required 7500miles. I was told then that they would cover only the timing chain replacement because it was on a recall and that the turbo charger would not be covered at all. They came to this conclusion due to the turbo going bad due to an outside influence what is that I asked and they had no answer. The answer I was givenm is it will not be covered under warranty and that is that and I have basically no recourse. There is clearly a problem with these cx7 as there are so many similar complaints all over the internet and yet Mazda refuses to pay on these part that should be covered under the powertrain warranty 6yrs/60,000 miles. The car gets too hot and burns the oil and that is what causes the sludge a manufactures defect not negelcet on oil change and filter maintenance. Other Mazda owner have the same result wether they oil changed at 3000, 4000, or the required 7500 how can we all have sludge in the engine. Obviously there is a manufaturers defect regarding this entire turbo system. Mazda needs to own up to the defects regarding the cx7 models and honor the customers warrenty work. The car has so many problems that they are presently not making it anymore. I do not have the money to layout and wait to be rembursed possibly by Mazda in the future this is a disgrace. I will never drive another Mazda vehicle again and I will not ever reccomend them to any one.