Oldsmobile Calais Map Light Bulb Size

The Oldsmobile Calais map light requires bulb size 562 or 906 depending on the specific configuration of the lighting assembly. Data for the bulb sizes covers the range from 1985 to 1987.

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
1987	562
1985-1986	906

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Festoon bulb, 44mm length, end-cap contacts. 12V, 12W.	562
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 8W.	906

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Additional Notes

The Oldsmobile Calais map light draws from two distinct bulb types across its model years: the 562 festoon bulb for 1987 and the 906 miniature wedge bulb for 1985-1986.
The 562 is a festoon-style bulb, meaning it is cylindrical in form and seats by pressing its end caps into spring-loaded metal clips rather than inserting into a socket.
The 562 bulb has a 44mm length, which is a critical fitment factor, as festoon bulbs must match the exact span between the housing clips to make proper contact.
The 562 operates at 12V and 12W, making it the higher-wattage option of the two bulb types listed for this vehicle.
The 906 is a T10 miniature wedge bulb, a form factor that uses a wedge-shaped plastic base to friction-fit directly into a matching socket without any separate metal contacts.
The 906 operates at 12V and 8W, drawing less power than the 562 used in the 1987 model year.
Both the 562 and 906 conform to ANSI standards applicable in the US and Canada, indicating standardized electrical and physical tolerances for each type.
The 562 and 906 are not interchangeable. Their base types differ fundamentally, as a festoon end-cap design and a wedge socket design require entirely different housing configurations.
The 1987 Oldsmobile Calais map light housing was designed around the festoon clip mount of the 562, while the 1985-1986 housings were built to accept the wedge base of the 906.