The Mercedes-Benz SL600 tail light utilizes a P21/4W bulb size for the lighting components located at the rear of the vehicle. Data for the specific bulb requirements covers the range from 1994 to 2002.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The outer tail light positions on the Mercedes-Benz SL600 use the P21/4W bulb type across all listed model years.
The P21/4W is an ECE-standard bulb, meaning it conforms to European and internationally recognized regulations for automotive lighting.
P21/4W bulbs carry a dual-filament design, with one filament rated at 21 watts and a second rated at 4 watts, allowing a single bulb to serve two distinct lighting functions within the same housing.
The BAZ15d bayonet base is the mounting interface for the P21/4W. The offset pins of the BAZ15d base are positioned asymmetrically, which physically prevents incorrect insertion and ensures the correct filament aligns with each circuit.
All listed outer tail light positions operate on a 12-volt electrical system, which is standard for passenger vehicles of this type.
The outer tail light specification for the Mercedes-Benz SL600 covers model years 1995-2002, with the P21/4W bulb type applying uniformly across that entire span.
Because the BAZ15d base uses an offset pin configuration, it is not interchangeable with single-filament bayonet bases such as the BA15s, despite a similar physical profile. Substituting an incompatible base type would result in improper fitment.
The dual-filament nature of the P21/4W means the lower 4-watt filament typically serves a continuous function such as a tail or position light, while the higher 21-watt filament serves an intermittent function such as braking or signalling.