Hi, Ive done the search in this site and I cant find anything about changing the timing chain. What I would like to know is, is there a certain time I MUST do the chain? Or is there signs when that tell me that I should do it soon. I would like to know so that I can prepare for it. BTW I have a 2.8L M104 engine in top condition with 105000kms or 65000 miles.

Chris