Thanks for the reply. I feel that this problem is more like a characteristic of the engine / exhaust system which should be unacceptable for such a prestige motor vehicle and purchase price. I wonder if anyone is experiencing this problem with an after market exhaust system and / or having the auto start stop permanently deactivated. I have today re waxed the car with the hope that the soot will "not stick" to paint work.
I will keep you posted
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