The Oldsmobile Alero brake light requires a 3057 bulb size for proper installation and function within the rear lighting assembly. Available data for the specified component covers the range from 1999 to 2004.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Oldsmobile Alero uses the 3057 bulb for its brake lights across all model years from 1999-2004.
The 3057 is a dual-filament wedge bulb operating at 12 volts, with a higher-wattage filament rated at 27W for braking and a lower-wattage filament rated at 7W, commonly used for combined stop and tail light functions.
The T25 designation on the 3057 refers to its wedge base size, which determines physical socket compatibility.
The 3057 conforms to ANSI standards applicable in both the United States and Canada, indicating a standardized specification shared across North American automotive applications.
The center high mount stop light on the Oldsmobile Alero uses the 921 bulb for all model years from 1999-2004.
The 921 is a single-filament wedge bulb rated at 12 volts and 16W, consistent with its dedicated stop light function requiring only one brightness level.
The T15 base of the 921 is physically smaller than the T25 base of the 3057, making the two bulbs non-interchangeable despite both being wedge-type designs.
Both the 3057 and 921 meet ANSI standards for the US and Canadian markets, reflecting a shared regulatory framework for automotive lighting in North America.
The lower wattage of the 921 relative to the 3057 reflects the differing output requirements between a supplemental center-mounted stop light and the primary brake light assemblies.