Just bought a 2010 X3 with 100k miles.

Here is the service history as a data point of what things were needed for the first 100k.
I think the X3 did really well, and needed very little.

Seller took a hit on depreciation ($30k down to $8k)
For repairs, seller spent $3500 in 7 years, which included $750 for tires.

I am expecting to spend more on maintenance, but less in depreciation.
These cars bottom out at $4k

• Brake Fluid Flush
  
• 4 New Tires
• Alignment
  
• Transfer Case Fluid
• Front and Rear Diff Fluid
• 6 Spark Plugs
  
• Oil Cooler Gasket
• Oil Stand Gasket (OFHG?)
  
• L/F Differential Output Seal
  
• 6 Coil Packs
• 1 Spark Plug (#1)
  
• Recall: Driver's Front Airbag
• Recall: PCV Valve Heater"
  
• Oil Cooler Gasket
• Oil Stand Gasket (OFHG?)
• Belt tensioner
• Belt
• Idler Pulley
  
• 2 Front Struts
• Battery Registered to Car