Is this merely mileage dependent or is time a factor. I am reading in this post that parts get brittle -- as you all know they get brittle over time. too. So, is a 17 year old car with about 50k miles due for a new chain?

__________________
Dan

1986 560SL (52.5k miles) sold 11/24/04

1987 560sl (55.6k miles)