Sorry, but I was refering to the timing chain guides - My car is 14 years old with 49k on it, and the 4.2L engine is notorious for timing chain failures due to broken chain guides.
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