My 1988 560SL has 125K on it and I'm worried about the timing chain. Not that anybody said it was bad, the dealer checked and said it was OK. Just the mileage and the threads I read. I'm a moderately capable mechanic, so my question is, How difficult is it to replace the chain and tensioners on this vehicle? Dealer wants $1000-1200 for it, total parts my cost is $400. Thinking of tackling it, any thoughts or experience? Also is there a good explanation of how to do it somewhere? The CD of the car leaves a bit to be desired. Thanks