I have a 1999 e300 turbo diesel with 75000 miles, on colder mornings it has rough idle with a loud knock (for about 5 seconds)and a small white plume of smoke at startup. Is this a sign of future problems ? and what can be done to fix this? Other than this it runs great.

Thanks,Anton

 

Thanks Forced Induction. What brand of glow plug is best for my model /year? best place to buy? Sorry about all the questions I'm new to diesels.