The BMW 3 Series requires regular service every 10,000 km or annually at an authorised service centre, using officially approved engine oil and parts. The manufacturer provides a 3-year unlimited mileage warranty, and Hong Kong owners can schedule maintenance through authorised BMW service centres. For Mild-Hybrid models (such as the M340i), the 48V battery is a high-voltage system and should only be inspected by factory-trained technicians.
BMW 3 Series 建議每 10,000 公里或每年返廠進行一次定期保養，使用官方認可嘅機油同零件。廠方提供 3 年不限里數嘅原廠保用，香港車主可透過寶馬授權服務中心預約維修保養。另外，採用 Mild-Hybrid 輕混能技術嘅型號（如 M340i），48V 電池屬於高壓系統，建議由原廠認證技師進行檢查。
