2018 BMW M4 bulb fitment uses LED lighting for both the low-beam and high-beam headlights. The supplied fitment data does not identify separate bulb codes or a projector/non-projector variation, so confirm the original headlamp configuration before ordering replacement parts.
LED fitment is also listed for the fog lights, daytime running lights, front and rear turn signals, brake lights, center stop light, tail lights, reverse lights, parking lights, cornering lights, and front and rear side markers. Exterior convenience lighting, including the license-plate and step lights, is also listed as LED.
Most interior lighting is LED as well, including the dome, map, trunk, and general interior lights. Two notable exceptions are the glove-box light, which is listed with bulb options 2825 and 98, and the vanity light, listed as 2723. Check the existing bulb or socket when servicing these locations, particularly the glove-box light where multiple fitment options are supplied.