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Hi mate,
Another Silverstone owner here just outside Edinburgh, in Bathgate.
I would imagine the interior jerk is where the driver has leant his arm on the door card while driving - so more than likely where the mark has came from. Possibly some APC and a gentle scrub with a soft nailbrush might work?
My cold start on my 16 plate car is also ridiculously loud as well and I know the loud cold start is something that's possible to have coded out. So possibly later M4's had this tamed down a bit or maybe the CP owner has had it coded out?
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