The sluggish performance and the erratic tachometer needle may not be related at all. That said, they could very well both be symptoms of the same problem. A lot of mechanics, when shown an erratic ...
We prefer the CX-8 and are wondering if it will be ok to mostly drive the CX-8 mostly short distances? Or will we ruin the diesel engine doing this? Given the CX-8 only arrived on the market in June ...
This is far from ideal use of a diesel with a DPF. Precautions you can take are to change the engine oil and filter every 7000 miles. Take the car on as many distance runs as you possibly can.