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To answer your question, I first scoped through the throttle valve using a mini scope bought at Costco but couldn't go very far since its only like 10 inches long!
Then I asked BMW to scope it as stated in another thread. Yesterday the SA told me they scoped it and found only a bit of oil then I asked to speak to the mechanic and he said that he didn't do it because carbon build up in diesel is not common!
I was angry but now, I'm in communication with BMW rep. and I will ask to do some preventive maintenance since there is a lot of people having this problem. Now I'm back where I started! Waiting for answer from them!
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