The Oldsmobile F85 front and rear side marker bulbs utilize 194 and 194NA sizes for forward positions, while rear positions require 194 and 1895 bulb configurations. A replacement chart documents bulb size specifications across the 1968 to 1972 production range.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Oldsmobile F85 uses three distinct bulb types across its front and rear side marker positions: the 194, the 194NA, and the 1895, all of which conform to ANSI standards recognized in both the United States and Canada.
The 194 is a miniature wedge bulb in the T10 form factor, rated at 12 volts and 3.78 watts. It is the most frequently specified bulb across the F85 side marker data, appearing in both front and rear positions for the 1970-1972 model years.
The 194NA shares the same T10 form factor, voltage, and wattage as the 194 but is distinguished by its natural amber glass construction, which produces a colored output without the use of a separate lens filter.
The Oldsmobile F85 front side marker for 1968-1969 specifies the 194NA, meaning those positions required the amber glass variant rather than the clear 194 used in later years.
The rear side marker for 1968 specifies the 1895, a T5 miniature wedge bulb rated at 12 volts and 0.9 watts. Its wattage is notably lower than the 194 series, making the two types electrically dissimilar despite sharing a wedge base style.
Because the 1895 operates at 0.9 watts compared to the 3.78 watts of the 194 series, substituting one for the other in the 1968 rear side marker position would result in a mismatched power draw for that circuit.
The T10 and T5 designations refer to the tubular bulb envelope width, expressed in units of one-eighth of an inch. A T10 bulb is 10 eighths wide and a T5 is 5 eighths wide, meaning the two are physically distinct and not interchangeable by size alone.
The rear side marker position transitioned from the 1895 in 1968 to the 194 in 1969, representing a change in both the bulb envelope size and the wattage for that specific location on the F85.
The 194 and 194NA are electrically identical, as both share the same voltage and wattage ratings. The sole functional difference between them is the amber glass coating on the 194NA, which affects the color of the emitted light.
All three bulb types specified for the F85 side markers use a wedge base, which is retained by friction rather than a bayonet or screw mechanism, though the physical size of the wedge base differs between the T5 and T10 envelopes.