Thanks guys. Spoke with CA yesterday and pre-owned GM. Told them about my concerns, and about the issues I've read about here. GM said they would be going over the truck completely today and they'll drive it for a couple of days and if everything OK they would sell, otherwise they won't sell it. I asked about an extended test drive and the GM told me if they clear the service issues, I can take it home for the weekend and 'live with it for a while'; then decide if I want to buy it. I'll wait to hear what they come up with after our next blizzard tomorrow, then see what's next.... I'll ask them to see the service records for the vehicle (it was purchased at that dealer) when (if) I get it for the extended drive. I guess I can find out the original customer's name from there...

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1997 E36 M3 (Sold)
2000 E39 M5
2010 E70 X5