A person that I am corresponding with tells me he has never herd of a verified case of a Mercedes timing chain breakage. It is all new to me to as the diesels I used to work on all had timming gears and I am the only one that I know that owns a mercedes (7 months so far). So how about some true experiences.
Or if they do not break but too much stretch causes a failure; what type of failure/s dose it cause?