Mercedes-Benz C63 AMG S high beam and low beam headlight bulbs both use H7 size replacement bulbs. The chart contains bulb size specifications for vehicle production spanning 2015 to 2019.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The H7 bulb is a single-filament halogen type operating at 55 watts with a nominal voltage of 12 volts, classified under the PX26d base designation, which features a two-pin configuration that locks into a bayonet-style socket.
The Mercedes-Benz C63 AMG S uses the H7 bulb for both high beam and low beam headlights across the 2015-2019 model years.
The H7 standard is defined by ECE Regulation 37, meaning bulbs carrying this designation from different manufacturers share the same base geometry and electrical ratings, though output and longevity may vary by product line.
Because the same H7 designation applies to both beam positions, the physical bulb installed in the high beam housing and the one installed in the low beam housing are of the same type, though the housings themselves direct light differently through their reflector or projector optics.
H7 bulbs are not interchangeable with H4 bulbs, which use a different three-pin base and carry a dual-filament design, nor with H11 bulbs, which share a similar wattage but use a PGJ19-2 base incompatible with H7 sockets.
The PX26d base of the H7 bulb requires a secure twist-lock engagement in the socket; an improperly seated bulb can cause intermittent electrical contact or premature failure of the bulb or socket.
Halogen bulbs in the H7 category are sensitive to contamination on the quartz envelope; oils from skin contact can create thermal stress points that reduce the operational lifespan of the bulb.
Replacement H7 bulbs rated above the standard 55 watts may exceed the thermal tolerances of the original headlight housing and wiring harness, as those components are designed around the stock wattage specification.