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Car: 2017 1.6 Tourer Sport
Join Date: 27th June 2007
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White/grey/blue sounds like a small amount of unburnt diesel.
Slightly worn engine will do this, compression not as high as when new, or a bit of wear on injectors
More likely glow plugs not as efficient as new.
Try operating glow plugs twice by turning key, wait for glow plug light to go out and then switch key off and repeat.
If smoke is less, may give you an indication?