What this part actually does
The CCV separator sits on top of or beside the valve cover depending on year, and its job is to knock oil droplets out of the blow-by gas before that gas gets routed back into the intake system. Inside there's usually a set of baffles or a filter media element and a pressure regulating valve. When it fails, oil starts making its way into the intake tract, fouling the turbo, coating the charge air cooler, or just burning off and making the truck smoke.
This one, A4720106662, fits the DD13, DD15, and D13 family in Freightliner trucks built roughly 2015-2023 — Cascadias mainly. Detroit changed these units a few times over the model run to address oil carryover complaints, so don't assume every DD13 uses the same separator just because the engine family matches.
If you're replacing one because of oil in the CAC or a rough idle with crankcase pressure issues, this is usually the part, but pull the old one and check the casting number stamped on it before you order.
Why the cross numbers match up
A4720106662 is the Detroit/Freightliner part number, and PAI builds an aftermarket version of it under several of their own catalog numbers — 841350, 20532891, 831114, and 21122541 all trace back to the same casting and mounting pattern. PAI also stamps some of their boxes DDEA4720106662 just so there's no question which OEM number it replaces.
The mounting flange, hose barb sizes, and internal valve spec all have to match for this to seal up and regulate crankcase pressure correctly — this isn't a part where 'close enough' works, because the pressure valve setting affects how the whole PCV system on the engine behaves. Wrong valve rating and you can get oil consumption issues or crankcase pressure codes even with a brand new part installed.
Bottom line: match your old part's casting number, not just the engine model, before you commit. DD13 and DD15 covered a lot of build years and Detroit revised this component more than once.
Ordering from PartStop
We keep this one in stock in Tacoma, so if you're a local fleet or owner-op and need it same day, call ahead and we'll have it on the counter. If you're not local, it ships nationwide and usually moves out within a day of the order.
Every unit we sell carries our standard 6+ month warranty, but like anything on the CCV or PCV system, confirm fitment against your VIN or the number stamped on the separator you're pulling off — Detroit doesn't always use the same casting across every truck in a given model year, and we'd rather you check than eat a return shipping charge.
If you're not sure which number you've got, snap a photo of the old part and give us a call — we cross-reference this stuff daily and can usually tell you in five minutes whether A4720106662 is the right call for your truck.
A4720106662 Cross-Reference & Interchange Numbers
These manufacturer and aftermarket numbers commonly cross-reference to A4720106662. 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 |
|---|---|
| Cross-Reference | PS-EX.01.FR.003, 996-1004 |
| PAI Industries | 841350/841350OEM/PAP841350, 20532891, 831114, DDEA4720106662, 21122541 |
Frequently asked questions
Does A4720106662 fit my 2018 Cascadia with a DD15?
Probably, but confirm it — pull the casting number off your current separator or check the engine's build sheet against your VIN. Detroit revised this part a few times across the DD13/DD15 run, so engine family alone isn't enough to guarantee a match.
Is this the same as the PAI 841350?
Yes, PAI 841350 (also listed as 841350OEM or PAP841350) is their aftermarket cross for the Detroit A4720106662 separator — same casting and mounting pattern. Still worth checking the old part's number since PAI's cross list covers several years of running changes.
How do I know if the CCV separator is actually the problem versus a turbo seal?
Oil pooling in the charge air cooler piping or excess oil consumption without visible leaks usually points to the CCV separator, especially if you're also seeing crankcase pressure fault codes. A turbo seal issue tends to show up with oil in the exhaust or intake manifold directly at the turbo. When in doubt, have a shop confirm before you swap parts.
Not sure it fits? We check before you pay.
Run your VIN and we’ll match parts to your exact truck, or call the counter — a person who knows trucks verifies fitment by OEM number before the order ships. No wrong-box returns.
More cross-reference guides
Need the part, not just the reading?
Every part below is a Premium Quality aftermarket Direct Replacement with published OEM cross-reference numbers, a 6+ month warranty and same-business-day shipping from Tacoma, WA. Not sure it fits? Run your VIN — or call and a person who knows trucks will verify fitment before you pay.