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Loads of problems with my Opel Astra...

Hi,

I have a 2006 Opel Astra 1.4 petrol. The management light is on and a mechanic said he thinks it's just an oxygen sensor, but recently my car has not been able to blow out hot air. The coolant seems to be gone, but it was only topped up recently and the engine is very hot after I drove it today and it sounded really loud when I turned on my air conditioning. Also, it is slightly vibrating and there is a whistling noise coming from the car.

Any help is welcome

What mileage to prevent DPF issues?

I have heard that low mileage on a diesel car can be bad for it. I have heard this can damage the DPF and other things. Many people think about the maximum mileage they consider to be ok when they purchase a used car. My question is this:  take the popular BMW 520d for example. What is the minimum mileage I can consider as being ok on a 2010/2011 car?