Peterbilt 567 Daytime Running Light Bulb Size

The Peterbilt 567 daytime running light utilizes bulb size 3157 or 4157 depending on the specific application. Data for the provided bulb sizes covers the range from 2016 to 2020.

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
2017-2020	3157
2016	4157

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Dual-filament wedge bulb (T25). 12V, 27W/7W.	3157
ANSI standard (US & Canada). Dual-filament wedge bulb (T25). 12V, 27W/7W.	4157

Other Locations

Additional Notes

The 3157 and 4157 are both ANSI-standardized bulb types recognized across the United States and Canada, placing them within a widely adopted North American automotive lighting standard.
Both bulb types share the T25 wedge form factor, a dual-filament design operating at 12 volts with a 27W/7W power split between the two filaments.
The dual-filament construction allows a single bulb to serve two distinct brightness levels, which is typical in automotive positions that combine a running light function with a higher-intensity signal or stop function.
The Peterbilt 567 uses the 3157 bulb for its daytime running light across the 2017-2020 model years.
The 2016 Peterbilt 567 uses the 4157 bulb rather than the 3157 for the same daytime running light position.
Although the 3157 and 4157 share identical voltage and wattage ratings as well as the same T25 wedge base, they are listed as separate part numbers, and fitment should follow the year-specific specification rather than treating them as interchangeable.