The colour of the engine oil doesn't mean anything, with a diesel you can expect to see black oil immediately after changing it.
Powers1 would be a great resource to comment on the idling issue. He is pretty familiar with that engine.
The Inspection I and Inspection II can be done yourself, but the caution is whether you know what you are looking for. They are really just a thorough going-over to make sure everything is OK. Easier to do on a hoist. Not worth the main dealer pricing IMO, but you may want to get a good independent to have it up on a lift and take a look at it. If you do it yourself, come back with any specific questions based on what you find.
Welcome to the board!
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2007 X3 3.0si, 6 MT, Premium, White
Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue
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