Hello JT//MC, welcome. X5 Meister hit it right on the head about your questions. Regarding the full air suspension, problem is a hit or miss. For me it was a hit but covered under CPO. Just about every component was replaced including the compressor. So far so good now. Its been about 18 months with no real issues. However I had to reset the error message twice since (compressor overheat error). I'm out of warranty now but luckily my Indie has a GT1 DIS. Do a search for "selflevel susp inact" here on x5world. You will find a lot of info. It wouldn't be a deal breaker for me either but its best to know about it. When you check out the 4.8is, you might want to raise an lower the suspension a bunch of times to see if it triggers the error. Before mine was overhauled, it was super sensitive and the error message plagued me. Also, when the full air system is inactive, the ride quality sucks big time. I couldn't stand it and would drive my other cars until is was repaired. Researching the service records on the vehicle would be good idea. BTW full front/rear air is standard on the 4.8is, optional on the 4.4i.
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