I've been on this forum before recently and was given excellent advice. Well, following them I had a compression test on my '03 w211 E500. Cylinder 8 was extremely low, but that was all the shop I took it to could tell me. Umm, what does this mean and what are some of the causes and what are possible remedies? It has 140k miles on it and otherwise runs well. As usual I thank you in advance for any responses...