The Oldsmobile 98 brake light utilizes unique bulb sizes 3057, 2057, 1157, 1034, and 1154 across various production periods. Available data covers the range of years from 1950 to 1996.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Oldsmobile 98 brake bulb specifications span from 1950 to 1996, covering three distinct sub-categories: the standard brake light and the Center High Mount Stop Light (CHMSL).
The 1157 bulb is the most frequently specified type across the Oldsmobile 98 brake light positions, covering the 1964-1990 model years (with exceptions in 1989 and 1988) as well as the full 1986-1996 CHMSL range. It is a dual-filament, 12V, 21W/5W bulb with a BAY15d bayonet base, conforming to ANSI standards for the US and Canada.
The 1034 bulb, used in the Oldsmobile 98 from 1953-1963, shares the BAY15d bayonet base and the same 12V, 21W/5W rating as the 1157, making it a variant of that type. Despite the electrical similarity, the two are distinct ANSI designations and are not confirmed as interchangeable by the specifications.
The 1154 bulb, specified for the 1950-1952 model years, is an older dual-filament BAY15d variant rated for both 6V and 12V operation, reflecting the transitional electrical system standards of that era in automotive manufacturing.
The 2057 bulb appears in the 1987-1989 and 1992 model years. It shares the BAY15d bayonet base with the 1157 but operates at a higher wattage of 26.9W/8W on 12V, making it a brighter variant. Its non-consecutive placement across the model year range indicates it was not a permanent replacement for the 1157.
The 3057 bulb is specified for the 1991 and 1993-1996 model years. Unlike the other brake bulb types in these specifications, it uses a T25 wedge base rather than a bayonet base, operating at 12V with a 27W/7W dual-filament configuration. This base type difference means the 3057 is not physically interchangeable with BAY15d-based bulbs such as the 1157 or 2057.
The 1992 model year is a notable case where the standard brake position uses a 2057 while surrounding years use either the 3057 (1991, 1993-1996) or the 1157 (1990). The BAY15d base of the 2057 differs from the wedge base of the 3057, confirming these two types are not interchangeable despite both being dual-filament 12V bulbs.
The CHMSL position on the Oldsmobile 98 exclusively uses the 1156 bulb across all listed years (1986-1996). The 1156 is a single-filament bulb with a BA15s bayonet base rated at 12V, 21W. Its single-filament design and BA15s base distinguish it from all bulbs used in the standard brake position, which are dual-filament types with either BAY15d or wedge bases.
The BA15s base of the 1156 and the BAY15d base of bulbs such as the 1157 and 2057 are physically incompatible, as the two bayonet base standards use different pin configurations. Substitution between these types is not supported by the specifications.
Across the full brake light specification history of the Oldsmobile 98, four distinct base types are represented: the BAY15d bayonet (1034, 1154, 1157, 2057), the T25 wedge (3057), and the BA15s bayonet (1156), with the 1154 further distinguished by its dual-voltage 6V/12V rating.