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My advice would be to get rid of it as soon as possible before the turbo and the rest of the engine goes.
I have a 53 reg Mazda 6 TDi. There are known issues with both the fuel pump and the engine oil pump / lubrication (as discussed in this forum).
Last year I noticed that the car would occasionally stall when idling and also when driving at low revs. It would take some time before restarting (1-15 min). Later in the year I was touring in Europe and the car stalled again, but wouldn't restart. A recovery guy managed to get enough fuel coming through to start it and I took it to the nearest Mazda dealer. They knew about the Denso valve problem on the fuel pump and fixed it for 270 Euros.
Later in the year I had bodywork and wheel arch corrosion repaired and alloy wheels refurbished for £1400. Then I got the timing belt kit replaced for its 80,000 mile service, and at the same time the power assisted steering pipe started leaking, so that was fixed (total £500). Other than the timing belt, I understand that all these issues would have been covered under a recall if the car had a full Mazda service history.
This year the car was driving fine. However, I noticed that it was using more oil than normal, and the residual engine oil also seemed to be very black. This was the first sign that things were going to go wrong. I could also start to hear a whine from the turbo which wasn't there before. A few months ago I was driving on the motorway when the turbo failed catastrophically within the space of a few minutes. I lost power and blue smoke was coming from the exhaust. The engine was still running smoothly and so I limped home the last few miles rather than call for a recovery. That was a mistake, but I now believe that the damage had already been done before the turbo failed. In the last few hundred yards before getting home, the oil light started flashing.
My local garage advised that the turbo could be replaced for £1000. When testing the engine, they believed that engine damage had not occurred. Unfortunately neither they nor I had read this forum. Thinking that I would be keeping the car a while, and that I had already fixed almost everything else, I went ahead with the repair. The garage also put the car through its MOT. When the work was done, we could hear a tapping from the engine, but it appeared to test drive fine. I drove the car twice since then on local runs, and the tapping became a knock, then a squeak. The second time the engine stopped on me and the car had to be recovered home. The recovery guy said that the knocking was terminal. Looks like the lubrication problem as described in the forum...
The car is being sold for £650 instead of market value £2200 with a working engine. A scrapyard offered only £250.
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