2018 BMW M4 Service and Repair Manual

This factory service and repair manual for the 2018 BMW M4 covers a coupe and a convertible sharing one engine, 3.0 liters, inline-six, double overhead camshafts, turbocharged, gasoline, in Base and CS trim. The turbocharging is what shapes the engine sections: charge air routing, boost control and the cooling capacity that supports them are specified rather than summarized. Chassis and body procedures then divide by body style, with torque values and adjustment figures given separately where the two cars do not share hardware.

Engines covered

• 3.0L inline-six — DOHC, turbocharged, gasoline

Body styles covered

• 2-door coupe
• 2-door convertible

Trims covered

• Base
• CS

Known issues on the 2018 M4. One recall is recorded for this year, against the front seat belts: the emergency locking retractors may have been assembled with a locking mechanism housing that does not match, so the belt may fail to lock and hold an occupant in a crash. Owners have logged six complaints, four of them on the fuel and propulsion system, with single entries under back-over prevention and the engine. Belt retractor removal, fuel system pressures and the camera circuits behind that report are all documented here.