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You may want to have them test the AC system. I had all the mechanicals for the AC in my E39 replaced a few months after I bought the car (so it was still under the OEM warranty, and CPO hadn't kicked in). For some reason, many of the internal components had rusted, so the compressor, evaporator and all lines had to be replaced. The dealer brought it to my attention -- I had it in for service and it failed to produce the required temps, and they noticed the rust when they did some additional digging. Oddly, we had just gotten back from a long road trip (AZ to CA, up the 101 to Pebble Beach Concours, and a few days in your neck of the woods playing tourist in SF, Napa and Sonoma) -- and we never noticed the AC not working well, so I'm guessing they caught is fairly early.
I don't know if that AC issue was common or not -- but might be worth a check.
The other thing you may want to check is the steering bushings (might not have the right name). They commonly go bad on E39s and start leaking oil. I had the passenger side replaced on mine when it started to leak -- I had noticed a small oil leak on my garage floor just inside the front tire "spot"...
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