Germany · 1975–present

BMW 3 Series

Maintenance Schedule & Service Guide

Recommended Oil

BMW Longlife-01 5W-30 full synthetic

Oil Change Interval

Every 10,000 miles or 12 months (never exceed service indicator)

Service schedule

Recommended intervals for the BMW 3 Series.

Oil & filter change10,000 mi / 12 mo

Microfilter (cabin)20,000 mi / 2 years

Spark plugs45,000 mi

Brake fluid flushEvery 2 years (strict)

Transmission fluid (ZF 8HP)50,000 mi (BMW says 'lifetime' — ignore that)

Coolant flush4 years

Differential fluid50,000 mi

Transfer case fluid (xDrive)50,000 mi

DIY tips

01
BMW's Condition Based Service (CBS) tracks fluid life electronically — reset it after every oil change.
02
Brake fluid: every 2 years without exception on any BMW — the DOT4 Low Viscosity fluid absorbs moisture rapidly.
03
N54/N55 engines: service the HPFP (high-pressure fuel pump) and injectors at 80k–100k miles to prevent cold-start issues.
04
Buy a BMW scanner (BIMMERLINK or INPA) — generic OBD-II readers miss most fault codes.

Reliability snapshot

Well-maintained BMWs are remarkably reliable. Budget $900–$1,500/year for maintenance; the F30 (2012–2019) is the most reliable modern 3 Series generation.