I have just purchased a 124 body style 300D. It has 131K on the oddometer and seems to have been quite well looked after. It has had the " football" replaced and drives quite well. It is not very fast in fact it seems about as quick as the 84 300D that I presently drive. I have read a little bit about cracking heads and was wondering if that was a mileage related occurance or there was a specific cause, other than overheating. There is a problem with the glow plug system as the car is a little reluctant to start and the warning light seems to have a mind of its own. Any insight with regard to owning this vechile would be gladly accepted.