I replaced the timing chain on my 300D at around 219k miles after purchasing the car with 217k miles on it. I checked it and it looked like the chain was stretched to the point where the crankshaft pulley was showing (if I remember correctly) around 3 or 4 degrees off when the cam indicator was centered. I went ahead and changed it just because I could. Changed the tensioner too. The rails looked fine. When I completed the job the cam indicator was aligned with the crank at 0 degrees. Car runs great now
