Oldsmobile Calais front and rear turn signal bulbs require a 2057 size bulb for proper operation. The replacement chart covers 1985 to 1987 model years with corresponding bulb size specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 2057 is the sole bulb type listed across all turn signal positions for the Oldsmobile Calais, covering model years 1985-1987 for both front and rear applications.
The 2057 is a dual-filament bulb, meaning it contains two separate filaments within a single envelope, allowing it to serve both a high-intensity and a low-intensity function from one unit.
The 2057 operates on a 12-volt electrical system and draws 26.9 watts on its high-intensity filament and 8 watts on its low-intensity filament.
The 2057 uses a BAY15d bayonet base, a two-pin base type where the two pins are offset at different heights to ensure correct orientation during installation.
The 2057 is classified under the ANSI standard and is recognized in both the United States and Canada.
The 2057 is described as a brighter variant of the 1157 bulb. While the two types share the same BAY15d base and are physically interchangeable in many sockets, the 2057 produces greater output on its high-intensity filament than the 1157.
Because the 2057 and 1157 share the same base configuration, a 1157 may physically seat in a socket designed for the 2057, though the two types differ in wattage output and are not electrically identical.