Hello,

Have a 07 e53 Fully loaded Diesel,
Love the car, does everything asked of it.

Only question is, its my wifes car, so it doesn't get driven quickly or hard at all, when I get in I give it a squirt every now and then and I notice
quite a puff of smoke out the rear if I was to floor the car from 60km/hr mark, only does this on the above, nowhere else, not continually,
I have not even tried to do it 2 times in a row, Only noticed this on a few occasions when I get in the car on different days.

My guess is carbon build up on the injectors,

I don't know if im correct or way off.

I've read quite a few threads on here on petrol additives etc, but there isnt a great deal of concrete talk on the diesel engine regarding this.

I remember using several different carbon cleaners on cars over the years some worked great some not so much, but all have been petrol engines, not a diesel, my best effort was a aerosol spray can that way sprayed into the engine on stop, then started and driven, and sprayed all the buildup out of the exhaust, never seeing it again...

Do we have an option for the diesel and is this what my above problem likely is?

Once again, helpful place, my first stop for any probs with the X.

Cheers