Blue smoke from diesel engine?

My car is a 1.4l Ford Fiesta diesel hatchback and it has been emitting a lot of blue smoke from the exhaust in the last couple of months. It usually happens when accelerating, but smoke also comes out when the car is idle and the engine is ticking over. When the car is idle it is small amounts of white smoke not really blue, that is only when accelerating. You can also feel the car shaking a bit when it is idle with the engine on if that helps and the oil level doesn't ever seem to decrease. There hasn't been any loss of power really, just lots of blue smoke which has lead people to come up to me at the lights and when i have parked to say i have something wrong with the car.

Any help much appreciated.

Blue smoke is from burning oil.time for a motor job

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