My X3 doesn't have high miles.

That said, the X3 is an E46 underneath. Pretty solid platform. I would consider the usual mileage related items as potential failures (transmission, cooling system components) and also add in the transfer case. It is the same as the E46 x transfer case but with a chain instead of gear drive. The chain is the likely wear item. The engine is generally very solid if reasonably maintained.

If they were highway miles, and the car was not driven hard, there can be lots of life left in it. It is still a 135,000 mile vehicle, but there should be fewer of the sort of nuisance failures the X5 gets at higher miles. All in my opinion.

Jeff

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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