What This Filter Does
This is the primary element in the air cleaner housing — the first line of defense between road dust and the turbo inlet. On Cascadia and Coronado chassis it sits in a front-mounted canister, which makes it one of the easier PM items to service without pulling anything else apart. Pleated paper media, radial seal style element, no wrench work required to swap.
Failure mode is almost always restriction, not rupture. Media loads up with dust and soot, restriction climbs, and the engine starts pulling harder for the same air. You lose fuel economy first, then you start seeing derates or turbo complaints on trucks that run gravel yards, construction sites, or dusty haul roads. A filter that looks grey on the outside can still be within spec — the restriction gauge tells the real story.
The other failure mode is a bad seal. If the element gets installed cocked, or the housing gasket surface is scored, unfiltered air bypasses the media entirely. That dust goes straight through the turbo and into the cylinders. Check the seal ring for cuts and check the housing lip for dents every time you change the element, not just when something goes wrong.
Why These Numbers Cross
03-42776-010 is the Freightliner-side number stamped on or boxed with the factory element. 03-42086-010 shows up on the same platform as a supersession or an alternate housing configuration for the same air cleaner family. Both describe an element with the same outside diameter, same seal geometry, and same media height, which is what actually determines whether it drops into the canister.
831.466010 is the Automann catalog number for the equivalent element. Aftermarket suppliers assign their own numbering but build to the same physical envelope — sealing diameter, overall length, and end cap design. When those three dimensions match and the seal type matches, the elements are interchangeable regardless of whose number is printed on the end cap.
Those numbers are listed here for identification only. PartStop is not affiliated with, endorsed by, or authorized by any OEM. A cross-reference is a starting point, not a fitment guarantee — confirm against the number printed on the element you're pulling out, or against your VIN, before you commit to a case.
Before You Order
Pull the old element and read the number off the end cap. Cascadia air cleaner housings changed across production, and a truck that's been through a previous owner or a body shop may not have the housing the build sheet says it has. The number on the part in your hand beats any catalog lookup. If the old element is unreadable, measure the sealing diameter and overall height.
Check whether your setup runs a safety element behind the primary. If it does, that's a separate part and it does not get replaced on the same interval as the primary. Also inspect the intake ducting from the housing to the turbo for cracked hose or loose clamps — a leak downstream of a brand new filter defeats the whole point of changing it.
03-42776-010 Cross-Reference & Interchange Numbers
These manufacturer and aftermarket numbers commonly cross-reference to 03-42776-010. Use them to identify the part — then confirm the exact fit by VIN or the number stamped on your old unit before you order. An interchange is a starting point, not a fitment guarantee.
| Brand / Line | Cross-Reference Numbers |
|---|---|
| Automann | 831.466010 |
| Freightliner | 03-42086-010 |
Frequently asked questions
Will 03-42776-010 fit my 2019 Cascadia with a DD15?
It's the correct primary element for Cascadia 2018 and newer applications, and DD13, DD15, and DD16 engines share the same air cleaner setup on those chassis. That said, confirm with your VIN or by matching the number on the element currently in the housing. Housing variations exist across production and the number on the old part is the reliable check.
What's the difference between 03-42776-010 and 03-42086-010?
Both are Freightliner-side numbers for elements in the same air cleaner family, and they share the sealing dimensions that determine fitment. One may appear as a supersession or an alternate housing callout depending on build date. Read the number off your old element and match it before ordering — don't assume based on model year alone.
How often should I change the primary air filter?
Go by restriction, not by mileage. Use the air filter restriction indicator or a manometer at the intake and replace when you hit the engine manufacturer's restriction limit. Trucks working dusty job sites will load a filter far faster than highway units. Do not tap or blow out a loaded element to extend it — that damages the media and lets dust through.
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