Welcome! You have what's called the E90 chassis, so check with the various BMW online forums in that section.
https://en.wikipedia.org/wiki/BMW_3_Series_(E90)
It's one thing to get the oil changed annually at the dealership, but I hope it didn't need too much work every 5k miles! With age/miles you're looking at replacing spark plugs, chance of a leaky valve cover gasket or oil filter housing gasket, strut & shock replacement, changing the fluids (transmission, differentials, brakes, coolant).
https://www.e90post.com/forums/
https://www.bimmerforums.com/forum/f...0-E91-E92-E93)
https://www.bimmerfest.com/forums/e9...-2006-2012.99/
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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