Engine Noise problems of the 2009 Mazda CX-7

I was driving on a highway. I heard a high pitched squealing sound then smoke started blowing out of my car. I could not see, and the other drivers behind me lost visability too. In the middle of this blinding smoke, surrounded by huge trucks, I lost aceleration. My instrumentation panel did not have any warning lights on. I was driving blind. I pulled off the highway as quickly as possible, and had my car towed to a dealership. The dealership said my turbo blew out, (which I guess sucked all the oil out of the car) I need a vvt valve and the timing chain is stretched. On a car with 57,000 miles! in checking on line, I found this has been a problem with the Cx-7 for 6 years and they are no longer making this model. I see that Mazda deals with these problems by stating the owner did not maintain the car properly, when in actuality, there is a serious problem with the turbo system and how the oil cools it. There is also a problem with "sludge buildup". I believe Mazda has been successfully avoiding a recall. But these issues are a real safety concern. I am very lucky that there was no accident as a result of this incident. These issues can be dangerous. When everything blew on my car, no one could see the road.

I own a 2009 Mazda cx 7 turbo. The veichle has had it's proper oil changes by a service garage not a "quick lube" place. The oil was castrol gtx 5w-30w, with fram oil filter. The longest interval between oil changes was 6000 miles and the shortest 4000 miles. The vehicle now has 45,664 miles on it and the wife complained about a high pitched noise and lack of performance . Brought to the Mazda dealer, the dealer said the turbo went and that Mazda will not cover it under warranty (60,000 warranty on drive train and turbo) because of engine sludge !! are you kidding me. . . Engine sludge, the proper oil viscousity was used at proper interval (Mazda says 7500 between oil changes). No signs of over heating, high engine temps, the vehicle is driven to work and back (4 miles away) 2x's per day 6 days a week. Sounds to me like engine oil is not getting up to temp. And this is causing the sludge, Mazda does not state this anywhere any time in their manual. I found this out only after researching on line. . . . Anyone else having issues with their Mazda ???? I ve owned turbos before and never had issues. My vehicle gets it's oil change by the same station and this Nissan has 190,000 miles on it with no problems and no sludge !!!.