What could be causing my BMW 3 Series diesel to smoke under acceleration?

I have a BMW 3 Series Touring diesel automatic bought from new in September 2006. I have had 50,000 miles of excellent trouble-free motoring and arrange regular servicing at the local BMW dealer. Recently I have noticed black smoke emissions from the exhaust when accelerating. Is this an indication of something serious that needs attention? Can you advise please?

Asked on 14 September 2013 by KR, Welwyn

Answered by Honest John
Might be caused by a failed turbo bearing oil seal.
Similar questions
I recently added injector cleaner to half tank of diesel in my 51-plate BMW 320d. I drove it as per normal, refuelled, and then started noticing blue smoke when at traffic lights. Performance seems ok....
I have a 2003 BMW 530d Auto (E60) that has done 124,000 miles. I recently experienced a sort of power lag, by this I mean when doing speeds of 75 - 85 mph and you press the accelerator (not kick-down but...
My son owns a (2001 model) Mitsubishi L200 2.5 diesel pick-up. When starting from cold, the vehicle belches out smoke. He was warned that the turbo is on the way out; however, whilst driving home from...
Related models
Superb to drive. Great handling and steering. Upmarket image. Economical diesel engines culminating in amazingly efficient 320d Efficient Dynamics at 109g/km of CO2.

Value my car

Save £75 on Warranty using code HJ75

with MotorEasy

Get a warranty quote

Save 12% on GAP Insurance

Use HJ21 to save on an ALA policy

See offer