The Oldsmobile Achieva front turn signal requires a 2057NA bulb size while rear turn signals use either 3057 or 2057 bulb sizes. The replacement chart covers 1992 through 1998 vehicle 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 Oldsmobile Achieva front turn signal uses the 2057NA bulb across all model years from 1992-1998, making it the sole front turn signal specification for the entire production run of this model.
The 2057NA is a dual-filament bulb with a BAY15d bayonet base, operating at 12V with a high/low wattage rating of 26.9W and 8W respectively, and features natural amber glass rather than a clear envelope.
The natural amber glass of the 2057NA produces the amber turn signal color directly from the bulb itself, as opposed to relying on a colored lens to achieve the required signal hue.
The 2057NA is described as a brighter variant of the 1157, meaning it shares the same BAY15d base and general form factor but produces greater light output on the high-filament circuit.
The Oldsmobile Achieva rear turn signal uses the 3057 bulb for model years 1993-1998, while the 1992 model year uses the 2057 instead.
The 3057 is a dual-filament wedge bulb of the T25 type, operating at 12V with a high/low wattage rating of 27W and 7W, and it does not share the BAY15d bayonet base found in the front turn signal bulbs.
Because the 1992 rear turn signal uses the 2057 and the 1993-1998 rear turn signal uses the 3057, these two bulbs are not interchangeable with each other despite both being dual-filament ANSI-standard bulbs, as they differ in base type.
The 2057 and 2057NA share the same BAY15d bayonet base and identical wattage ratings of 26.9W and 8W, with the only distinction being the natural amber glass coating present on the 2057NA.
All three bulb types specified for the Achieva, the 2057NA, 3057, and 2057, conform to ANSI standards applicable in both the United States and Canada.
The front and rear turn signal bulbs on the Achieva are not interchangeable with each other, as the front position requires a BAY15d bayonet-base bulb while the rear position from 1993 onward requires a T25 wedge-base bulb.