Oldsmobile Aurora front turn signal bulbs utilize a 3157 or 3157NA size, while rear turn signal bulbs require a 3057 size. The replacement chart covers 1995 through 2003 model years with corresponding bulb specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Oldsmobile Aurora uses three bulb types across its front and rear turn signals: the 3157, 3157NA, and 3057, all of which share the same T25 wedge form factor and identical electrical ratings of 12V with a dual-filament output of 27W and 7W.
All three bulb types conform to ANSI standards recognized in both the United States and Canada, placing them within a widely standardized specification framework used across North American automotive lighting.
The dual-filament design in each bulb type serves two brightness levels within a single housing, with the higher 27W filament typically serving the turn or brake function and the lower 7W filament serving a parking or running light function.
The front turn signal of the Oldsmobile Aurora (2001-2003) uses the 3157 bulb, which has a clear glass envelope.
The front turn signal for model years 1995-1999 uses the 3157NA, which is physically and electrically identical to the 3157 but features a natural amber-tinted glass envelope that produces an amber output without relying on a colored lens.
The 3157 and 3157NA are not interchangeable in applications where lens color determines the amber output, since substituting a clear-envelope 3157 in place of a 3157NA in a clear-lens housing would alter the visible signal color.
The rear turn signal across all Aurora model years covered in the specifications, from 1995 through 2003, uses the 3057 bulb exclusively.
Although the 3057 and 3157 share the same T25 wedge base and voltage rating, they are distinct part numbers and may differ in filament construction or current draw characteristics, making direct substitution a matter requiring verification against the vehicle's socket and circuit design.
The year 2000 is not represented in either the front or rear turn signal data for the Aurora, as the specifications contain no entries for that model year.