I just purchesed a used 2003 Mercedes S500 4Matic, but after a few hours (like 3-4 hours) It drops to the floor just in the front mostly to the drivers side. I reserched and found out I had two options either buy struts from Arnott or replace seals on my struts I decided to go with changing seals so i whent to my local MB dealer and bougth seals and replaced them. Paid $120 for each set and bougth a tool to change them on EBAY. Well after all that car is still droping .... What else can it be only the front drops?? Can it be a leak in the compresor, the lines???? I did a soapy water test and it never showed a leak on the top seals but since i already baugth seals figured why not change the to see. SO SOMEONE PLEASE HELP!!!!!! Thanks!!