I have a 91 300D 2.5 with only 77K original mileage. I checked the chain for stretch a couple of weeks ago and was astonished to find that it currently has 5 degrees of stretch. This measurment was taken using the factory procedure at 2mm of valve lift, not the old "line up the marks" approach. I'm really surprised at this amount of stretch since the car came with records indicating oil changes every 4-5K miles.

I did look up the factory recall on the 602 chains - it was in a Star issue a couple of years ago. As I recall it applied to early versions of the 602.962. My 91 model was NOT in the recall so I can say that maybe you should at least check the chain for stretch since it would appear that at least some examples of this engine DO seem to have chain stretch issues. I also agree with Sixto, I have heard (second and third hand) about some chain failures with 602 engines.

I'll be doing the chain in my car as soon as I can get the time.

Tim