Freightliner Cascadia Oil, Fuel & Air Filter Basics
A practical overview of Cascadia filtration — air elements, Detroit fuel/water separators, and oil service kits.
Freightliner Cascadia is one of the most common Class 8 platforms on US highways. Filtration packages vary by engine (Detroit DD13/DD15/DD16 or Cummins ISX/X15) and fuel-processor housing.
Air filtration
Common Cascadia air elements include 03-42776-010 (2018+) and AF27879 on earlier/alternate airboxes. Always match the OEM air filter chart for your year.
Fuel & water separation
Detroit-powered Cascadias may use cartridge separators (R61709), spin-on/style elements (FS19915), DAVCO Fuel Pro elements (FS20083), or Detroit service kits (A4700903151 / A4720921705). The housing model is the truth source.
Oil service
Gen 5 Detroit engines often use cartridge kits such as A4711800209. Confirm engine vintage before ordering.
Shop all Freightliner filters or jump to fuel filters and oil filters.
Frequently Asked Questions
Do all Cascadias use the same air filter?
No. Model year and airbox design matter. Confirm OEM numbers such as 03-42776-010 or AF27879 against your truck.
Which fuel filter does a DD15 Cascadia use?
It depends on the fuel processor. Common elements include FS19915, R61709, FS20083, and Detroit kits like A4720921705 — match the housing stamp.