Oldsmobile 442 Dome Light Bulb Size

The Oldsmobile 442 dome light requires bulb sizes 161 and 211-2 for the interior illumination system. Data for the specified components covers the period from 1964 through 1971.

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
1971	161
1964-1970	211-2

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 1W.	161
ANSI standard (US & Canada). Festoon bulb, 41mm length, SV8.5 base. 12V, 12W.	211-2

Other Locations

Additional Notes

The 211-2 is the dominant bulb type across the Oldsmobile 442 dome light specifications, appearing in seven of the eight model years covered, specifically 1964-1970.
The 211-2 is a festoon-style bulb with an SV8.5 base, a 41mm length, and operates at 12 volts with a 12-watt output.
Festoon bulbs of the 211-2 type make contact at both ends of the bulb body rather than through a base pin or wedge, which is characteristic of the SV8.5 base designation.
The 1971 Oldsmobile 442 uses a 161 bulb for the dome light, which differs in both type and wattage from the 211-2 used in prior model years.
The 161 is a miniature wedge bulb of the T10 form factor, rated at 12 volts and 1 watt, making it significantly lower in wattage than the 211-2.
The T10 wedge base of the 161 and the SV8.5 festoon base of the 211-2 are physically incompatible, meaning the two bulb types are not interchangeable with each other.
Both the 161 and the 211-2 conform to ANSI standards recognized in the United States and Canada.
The shift from the 12-watt 211-2 to the 1-watt 161 between the 1970 and 1971 model years represents a substantial reduction in the dome light's power draw.