Need some technical advice. I have a 93 300D 2.5T. The timing chain broke a few months and toasted the engine. It has since been determined that the oil pump on that motor is toast also (tried to reuse it on a replacement engine...long story). My mechanic has suggested the oil pump went first, and that caused the timing to chain to break. I have a hard timing comprehending that one. At the time of chain failure, i was leisurely driving about 30mph on a quite city street and simply heard a snap on the car just drifted to a stop...there was not a second of other noise other than the metal snap sound (sounded like a drove over a piece of sheet metal on the road). I assume i would have had at least a nanosecond of engine distress sound or engine operation dropoff if the oil pump had failed first, right? what makes sense...did the timing chain or oil pump failure come first?