Diesel Engine Problems of Mazda CX-7

I took my 2007 Mazda cx7 for service and two safety recalls, last year. The replaced the lower control arms at the front end. They also did the safety recall 9516e=passenger air bag replacement. After a while the air bag dash red light comes on and stays on for a while. My cx7 has 97,500 miles and now my engine sounds like is a diesel engine when I am at a stop traffic light. It seems like the timing chain is stretching. They have not added this variable valve timing defect as a safety recall, after all this is a Ford engine and I was expecting this Mazda to last up to the 200,000 miles.

See all problems of the 2007 Mazda CX-7 🔎.

This vehicle was originally purchased used by me daughter, since the failure my wife and I bought it, I replaced the faulty turbo charger and it is now back in service. Though my wife has very limited faith in the vehicle at this time. The issue is that when the vehicle was taken to Mazda, the dealership mechanics/service mgr stated that the engine needed to be replaced at a cost of over $8000. 00. Being a mechanic myself I knew that the engine ran exceptionally well but that the turbo had a burned up cartridge and needed to be replaced. In doing the work I realized that the design of the routing of oil tubing created the failure of the turbo. Also, the fact that Mazda does not indicate that their (any) turbo charged gasoline engine needs to be idled to cool the turbo assembly after driving before shutting off the engine. As is common practice with diesel engines and racing engines that are turbo charged. Nor did they engineer and install a timer device which would do this for the consumer so that this failure would be avoided. I have read of many of these failures in the us on forums and Mazda has forced most to pay for new engines when they were not needed.