This is my secon Mazda 6 diesel estate. It’s done about 90k and am now being quoted £2,000 to strip the engine down due to carbon buildup, and the car can’t be driven until this is done%. I’ve had the car since brand new and have had the oil filter cleaned every 6,000 miles as instructed. the Mazda garage said they had 2 other Mazda 6’s in awaiting the same repair. Anybody else had this issue? If so, what did you do to fix it and how much did it cost?