I just had my s500 checked out at the dealer (charged me $100 for the diagnosis). they told me that my front shocks are bad. I confirmed that with an indy. all he did was pushed down in front of the car and if the car didn't stop bouncing then the shocks are getting weak - no tension. that could be causing the louder than normal noise when going over bumps that I was experiencing. indy is charging me about $400 including labor for 2 new bilpsteins. dealer quoted me $760. I can't believe they charged me $100 just for looking over the suspension. I also paid them $45 for replace wiper inserts b/c my old one makes noise. Still making a little noise after the replacement - kinda wasted my money and time at the dealer. indy's are just as good as them dealer.