Hi everyone, Have just taken the plunge and purchased a 1999 SL600 Sport....I am a sucker for punishment and the V12 lure was too strong for me! The history on the car was great, 2 owners only...always main dealer serviced and cherished etc. It is a wonderful machine, the engine is simply a masterpiece even compared with the very best and I think the looks are becoming increasingly classic. It is silver on black with the panoramic roof and all the toys the '600 came with. It has a few minor niggles which I am working through slowly - replacement of bonnet pad, worn control arm balljoints (my current diagnosis for the low speak 'clunk' on uneven surfaces, especially when steering), a misbehaving o/s xenon that only illuminates when it feels like it...minor abberations to what is a magnificent car. Im aiming to gently restore it over time to make it as OEM and factory fresh as possible but first I want to make sure its mechanically sound. I did a lot of research on the cars and the ADS (ADS II I believe on my car) is a cause for concern and this is where my current query relates to. The ADS appears to be working fine - the ride is supple and smooth in normal mode and significantly more taught in 'sport'. In addition the car also raises up and down correctly on demand (albeit pretty slowly and with a bit of creaking/noise). However I have noticed that the o/s rear corner sits 2-3cms lower in any mode than the other 3 corners (they all sit at 68cms from the ground and the o/s rear is more like 65.5cms) . Obviously this is not right. Having consulted the history on the car the previous owner spent £1700 500 miles ago having a new control valve fitted and the system bled and refilled at MB Bedford to cure a leak. Could it be that the system was not properly recalibrated / levelled afterwards which explains the slight dip on the o/s rear wheel? If there are any DIY diagnostics I can try before dropping it into MB myself to investigate (likely at huge cost) please do let me know....perhaps I should not be worrying about it?! Any info would be really appreciated...ive scoured the forums and all the topics on ADS seem to be around the system not working / warning lights on....nothing with my particular problem. Thanks in advance! Will get some pics of the car up here once the sun comes out.