Steve - not to hijack Damon's thread, but I'm about to do the upper guides on my 560SL. It has 40,000 miles on it and I am assuming everything is original. I have a new tensioner on hand that someone gave me and was debating on whether to change it now or not. No issues noticed with rattling on start up. Just because I happen to have one on hand, should I go ahead and change it or save it for the next time?

Thanks.

__________________
Len
'59 220S Cabriolet-SOLD and living happily in Malta
'83 240D 351,500 miles original owner-SOLD
'88 560SL 41,000 miles - totaled and parted out
https://sites.google.com/site/mercedesstuff/home
'99 E300 turbo 227,500 miles
'03 SLK320 40,000 miles - gave to my daughter
'14 Smart electric coupe 28,500 miles
'14 Smart electric cabriolet 28,500 miles
'15 Smart electric coupe 28,000 miles