If it's a one-owner car that's a great start - you should have access to all of the service records. Oil changes at 5k miles is a thing of the past - I'm sure the car in question didn't have that done unless the owner did it. With condition-based service (CBS) the car could go 15k miles before the dealer changed it. Probably ready for a coolant change/flush if it hasn't been done.
Take it to Terry for a pre-purchase inspection:
https://www.terrysaytherauto.com/
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2015 BMW 228i in EstorilBlau II Metallic / Terra Dakota Leather - 6-speed manual, M Sport Package, Cold Weather Package, Lighting Package, Premium Package, Harman Kardon premium sound, Anti-theft alarm system, Blue Metallic Matt Accent Moldings, Aluminum Hexagon Interior Strips, Anthracite Headlining