Oldsmobile Aurora Back Up Light Bulb Size

The Oldsmobile Aurora back up light requires bulb size 3155, 2355, or 3057 depending on the specific version of the vehicle. Available information covers a range from 1995 through 2003.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

Bulb Size by Year Range

Years	Bulb Size
2003	3155
2001-2002	2355
1999	3155
1997-1998	2355
1995-1996	3057

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Single-filament wedge bulb (T25). 12V, 27W.	3155
ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base. 12V.	2355
ANSI standard (US & Canada). Dual-filament wedge bulb (T25). 12V, 27W/7W.	3057

Other Locations

Additional Notes

The Oldsmobile Aurora backup light specifications reference three distinct bulb sizes across its production years: 3155, 2355, and 3057, all of which conform to ANSI standards recognized in the United States and Canada.
The 2355 bulb is the most frequently specified across the Aurora's model years, appearing in the 1997-1998 and 2001-2002 model years.
The 2355 is a dual-filament bulb operating at 12 volts and uses a BAY15d bayonet base, a twist-and-lock mounting style that differs from the wedge-style base found on the other two bulb types in these specifications.
The 3155 bulb is a single-filament wedge type rated at 12 volts and 27 watts, classified under the T25 envelope designation, which refers to its tubular glass shape.
The 3057 bulb shares the T25 wedge form factor with the 3155 but carries a dual-filament design rated at 27 watts on its primary filament and 7 watts on its secondary filament, operating at 12 volts.
Because the 3155 and 3057 share the same T25 wedge base, physical fitment into the socket may be possible between the two, but their filament configurations differ, making them functionally non-interchangeable for backup light applications.
The 2355 uses a bayonet base and is therefore not physically interchangeable with either the 3155 or the 3057, which use wedge bases.
The Oldsmobile Aurora (2003) uses the 3155 single-filament bulb, while the immediately preceding 2002 model year uses the dual-filament 2355, indicating a socket type change between those two model years.
The 1995-1996 Aurora models share the 3057 specification, making those two years the only consecutive pair in the dataset with an identical bulb size.
The 1999 Aurora returns to the 3155 specification after the 1997-1998 model years used the 2355, reflecting another base-type transition that affects socket compatibility.