Oldsmobile Regency Dome Light Bulb Size

The Oldsmobile Regency dome light requires bulb size 906 or 168 depending on the specific configuration of the vehicle. Data for the bulb sizes covers the range from 1997 to 1998.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

Bulb Size by Year Range

Years	Bulb Size
1998	906
1997	168

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 8W.	906
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 4.9W.	168

Other Locations

Additional Notes

Both bulb sizes specified for the Oldsmobile Regency dome light, the 906 and the 168, share the same T10 miniature wedge form factor and operate on a 12-volt circuit, yet they are not interchangeable due to a difference in wattage.
The 906 bulb, fitted to the 1998 Regency, draws 8 watts, while the 168 bulb, fitted to the 1997 model, draws 4.9 watts, meaning the two bulbs place different electrical loads on the same style of socket.
Both bulbs conform to ANSI standards recognized in the United States and Canada, classifying them as standardized components within North American automotive lighting.
The T10 wedge base design used by both bulbs relies on the bulb's glass envelope itself to make contact within the socket, with no separate metal base or pins involved.
Although the 906 and 168 share physical compatibility at the socket level due to their identical T10 base, substituting one for the other would alter the wattage delivered to the dome light circuit.