The Oldsmobile LSS uses 3357 or 3157NA bulb size for front turn signals and 3057 or 2057 bulb size for rear turn signals. The replacement chart covers 1996 to 1999 production years with corresponding bulb size specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 3357 and 3157NA bulbs share the same T25 wedge base and 12V/27W high-filament rating, which places them in the same general bulb family despite their functional differences.
The 3357 is a single-filament bulb, meaning it serves only one lighting function, while the 3157NA is a dual-filament bulb rated at 27W/7W, allowing it to handle two brightness levels within a single housing.
The "NA" designation in 3157NA refers to natural amber glass, which produces an amber output without relying on an amber lens or housing to filter the light.
The Oldsmobile LSS front turn signal alternates between the 3357 and 3157NA across model years, with 1997 and 1999 using the 3357 and 1996 and 1998 using the 3157NA. These two bulbs are not interchangeable due to the difference in filament count and base configuration despite sharing the T25 form factor.
The 3057 and 3157NA share the same dual-filament 27W/7W rating and T25 wedge base, but the 3057 uses clear glass while the 3157NA uses natural amber glass, making them distinct parts for distinct positions.
The Oldsmobile LSS rear turn signal used the 3057 across 1997-1999, a dual-filament T25 wedge bulb rated at 12V, 27W/7W.
The 1996 model year rear turn signal uses the 2057, which differs from all other bulbs in these specifications by using a BAY15d bayonet base rather than a wedge base, making it physically incompatible with sockets designed for T25 wedge bulbs.
The 2057 is noted as a brighter variant of the 1157, with a high-filament rating of 26.9W compared to the 1157's 26.9W nominal, and it shares the same BAY15d base type, meaning 1157 sockets are physically compatible, though output levels may differ slightly.
All four bulb types across these specifications conform to ANSI standards applicable in both the United States and Canada, indicating standardized electrical and photometric performance requirements.
The shift from the 2057 bayonet-base bulb in 1996 to the 3057 T25 wedge-base bulb in 1997 for the rear turn signal position reflects a socket-level change in the Oldsmobile LSS, and the two bulbs cannot be substituted for one another without a corresponding socket change.