Doesn't MB recommend a timing chain replacement on all V8's after 100k? I would change it - but try and find someone reasonable as it isn't that urgent.
2003 S500 Black/Charcoal
1990 560SEL 61k Arctic White/Grey
1988 420SEL Black/Palomino Sold @ 85k
1987 420SEL Midnight Blue/Grey
1986 420SEL Diamond Blue/Grey
1983 380SEL Champagne/Palomino