The Oldsmobile Delta 88 brake component utilizes 1157, 2057, 1156, and 3057 bulb sizes depending on the specific version of the vehicle. Available information covers the range from 1965 through 1991 for the specified lighting components.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Oldsmobile Delta 88 brake light specifications span model years 1965 through 1991, covering four distinct bulb types across that range.
The 1157 is the most frequently specified brake bulb for the Delta 88, covering model years 1965-1990 with the exception of 1986-1990 where other types appear for certain years. It is a dual-filament bulb with a BAY15d bayonet base, rated at 12V and 21W/5W, where the higher wattage filament serves the brake function and the lower serves running light duty.
The 2057 bulb was specified for the 1987-1988 Delta 88 brake lights. It shares the BAY15d bayonet base with the 1157, making it physically compatible with the same socket, but it draws more power at 26.9W/8W, producing a brighter output on both filaments.
Because the 2057 and 1157 share the BAY15d bayonet base, they are physically interchangeable at the socket level, though their wattage ratings differ. Substituting one for the other may affect brightness output.
The 3057 was specified for the 1991 Delta 88 brake light. Unlike the 1157 and 2057, it uses a wedge-style T25 base rather than a bayonet mount, making it physically incompatible with sockets designed for BAY15d-based bulbs.
The 1989 Delta 88 brake light specification calls for the 1156, a single-filament bulb with a BA15s bayonet base rated at 12V and 21W. A single-filament brake bulb handles only one circuit function, unlike the dual-filament types used in most other model years.
The 1156 uses a BA15s base, which is a single-contact bayonet mount. The 1157 and 2057 use a BAY15d base, which is a double-contact bayonet mount. These base types are not interchangeable despite their similar physical appearance.
The Center High Mount Stop Light (CHMSL) on the Delta 88 used the 1156 bulb across model years 1986-1991. This single-filament configuration is consistent with the CHMSL function, which operates only as a stop light with no combined running light duty.
All four bulb types specified for the Delta 88 brake lights conform to ANSI standards recognized in both the United States and Canada, indicating standardized electrical and photometric performance requirements.
The 1990 Delta 88 brake light returns to the 1157 specification after the 1987-1988 use of the 2057, while the CHMSL for that same year retains the 1156, meaning the 1990 model uses two different bulb types across its brake lighting system.