OVERVIEW
Genuine VW/Audi 4.0T V8 Engine Oil Separator
079-103-542-E is the genuine oil separator assembly used in the matched 4.0L twin-turbocharged V8 crankcase ventilation installations below. It separates entrained oil from crankcase vapors before those vapors continue through the engine’s ventilation system. Correct operation helps maintain the intended vapor flow and limits oil carryover into the intake path.
This listing supplies one oil separator assembly as represented by the archive photograph, including its housing and integrated connections. It is not a complete engine ventilation overhaul kit. Identify any separate hoses, mounting hardware or additional seals required by the specific repair procedure before beginning service.
Technical details
- OEM number: 079-103-542-E / 079103542E.
- System: Crankcase ventilation and oil separation.
- Confirmed engine family: Matched Audi EA824 4.0L twin-turbocharged gasoline V8 applications.
- Assembly features: Molded separator housing, ventilation connections and the heat shielding shown in the original photograph.
- Quantity: One separator assembly per purchased unit.
- Confirmed earlier revisions: 079103542B and 079103542D where the factory replacement assignment specifies this E revision.
The separator must match the original ventilation layout, hose connections and sealing interfaces. Engine size alone is not enough to identify the correct assembly across different Audi engine generations. Verify the full part number and factory replacement assignment before ordering, especially where the engine or ventilation components have previously been changed.
Common reasons to replace
Replacement may be required when the housing is cracked, a connection is damaged, the separator has an internal ventilation fault or diagnostic testing identifies incorrect crankcase pressure or excessive oil carryover. Whistling, rough idle, oil leakage, increased oil consumption or intake contamination may warrant inspection of the crankcase ventilation system.
Those symptoms can have other causes. Check the connected hoses, sealing surfaces and engine condition, and follow the specified diagnostic procedure before replacing the separator. Turbocharger faults, worn engine components or an unrelated intake leak require separate diagnosis. A new separator does not repair a split hose, damaged connector or leaking seal elsewhere in the system.
Fitment
The following table identifies confirmed engine and trim applications for this E-revision separator. Match the installed ventilation arrangement and the full factory part assignment. Replacement coverage for earlier B/D revisions applies only where that specific factory supersession is confirmed.
| Vehicle | Model years | Engine | Configuration | Application restrictions |
|---|---|---|---|---|
| Audi A8 | 2013–2015 | 4.0L twin-turbocharged gasoline V8; EA824 | D4; Base; standard wheelbase quattro sedan; No transmission-specific restriction listed for the confirmed separator | Original 4.0L crankcase ventilation installation assigned 079103542E, including confirmed earlier 079103542B/D replacements. Match full revision and installed ventilation layout; one separator assembly supplied. |
| Audi A8 | 2013–2016 | 4.0L twin-turbocharged gasoline V8; EA824 | D4; L long-wheelbase quattro sedan; No transmission-specific restriction listed for the confirmed separator | Original 4.0L crankcase ventilation installation assigned 079103542E, including confirmed earlier 079103542B/D replacements. Match full revision and installed ventilation layout; one separator assembly supplied. |
| Audi A8 | 2017 | 4.0L twin-turbocharged gasoline V8; EA824 | D4; L Sport long-wheelbase quattro sedan; No transmission-specific restriction listed for the confirmed separator | Original 4.0L crankcase ventilation installation assigned 079103542E, including confirmed earlier 079103542B/D replacements. Match full revision and installed ventilation layout; one separator assembly supplied. |
| Audi RS7 | 2014–2018 | 4.0L twin-turbocharged gasoline V8; EA824 | C7; Base; quattro Sportback; No transmission-specific restriction listed for the confirmed separator | Original 4.0L crankcase ventilation installation assigned 079103542E, including confirmed earlier 079103542B/D replacements. Match full revision and installed ventilation layout; one separator assembly supplied. |
| Audi RS7 | 2016–2018 | 4.0L twin-turbocharged gasoline V8; EA824 | C7; Performance; quattro Sportback; No transmission-specific restriction listed for the confirmed separator | Original 4.0L crankcase ventilation installation assigned 079103542E, including confirmed earlier 079103542B/D replacements. Match full revision and installed ventilation layout; one separator assembly supplied. |
| Audi S7 | 2013–2016 | 4.0L twin-turbocharged gasoline V8; EA824 | C7; Base; quattro Sportback; No transmission-specific restriction listed for the confirmed separator | Original 4.0L crankcase ventilation installation assigned 079103542E, including confirmed earlier 079103542B/D replacements. Match full revision and installed ventilation layout; one separator assembly supplied. |
| Audi S7 | 2017–2018 | 4.0L twin-turbocharged gasoline V8; EA824 | C7; Premium Plus or Prestige; quattro Sportback; No transmission-specific restriction listed for the confirmed separator | Original 4.0L crankcase ventilation installation assigned 079103542E, including confirmed earlier 079103542B/D replacements. Match full revision and installed ventilation layout; one separator assembly supplied. |
| Audi S8 | 2013–2016 | 4.0L twin-turbocharged gasoline V8; EA824 | D4; Base; quattro sedan; No transmission-specific restriction listed for the confirmed separator | Original 4.0L crankcase ventilation installation assigned 079103542E, including confirmed earlier 079103542B/D replacements. Match full revision and installed ventilation layout; one separator assembly supplied. |
| Audi S8 | 2016–2018 | 4.0L twin-turbocharged gasoline V8; EA824 | D4; Plus; quattro sedan; No transmission-specific restriction listed for the confirmed separator | Original 4.0L crankcase ventilation installation assigned 079103542E, including confirmed earlier 079103542B/D replacements. Match full revision and installed ventilation layout; one separator assembly supplied. |
| Audi S6 | 2013–2015 | 4.0L twin-turbocharged gasoline V8; EA824 | C7; Base; quattro sedan; No transmission-specific restriction listed for the confirmed separator | Original 4.0L crankcase ventilation installation assigned 079103542E, including confirmed earlier 079103542B/D replacements. Match full revision and installed ventilation layout; one separator assembly supplied. |
| Audi S6 | 2016–2018 | 4.0L twin-turbocharged gasoline V8; EA824 | C7 facelift; Premium Plus; quattro sedan; No transmission-specific restriction listed for the confirmed separator | Original 4.0L crankcase ventilation installation assigned 079103542E, including confirmed earlier 079103542B/D replacements. Match full revision and installed ventilation layout; one separator assembly supplied. |
| Audi A8 | 2018 | 4.0L twin-turbocharged gasoline V8; EA824 | D4; L long-wheelbase quattro sedan; No transmission-specific restriction listed for the confirmed separator | 4.0L gasoline V8; production after 08/01/2016; original ventilation installation assigned 079103542E. Verify installed separator and factory replacement assignment; one assembly supplied. |
| Audi S6 | 2016–2018 | 4.0L twin-turbocharged gasoline V8; EA824 | C7 facelift; Prestige; quattro sedan; No transmission-specific restriction listed for the confirmed separator | Original 4.0L crankcase ventilation installation assigned 079103542E, including confirmed earlier 079103542B/D replacements. Match full revision and installed ventilation layout; one separator assembly supplied. |
Installation and service guidance
Follow the factory repair procedure for access to the separator in the 4.0T engine compartment. Allow hot components to cool, keep dirt out of open intake and ventilation passages and record the original hose routing before disconnecting parts. Inspect the surrounding connections and seals for damage during removal.
Install the replacement without forcing hose fittings or distorting the housing. Renew the separately required seals and fasteners identified by the repair procedure, and tighten the specified mounting hardware to the engine-specific values. Retain the required heat protection and restore all disconnected hoses and wiring correctly.
After installation, perform the required checks for sealing, crankcase ventilation operation and stored faults. Inspect for leaks and confirm that the original complaint has been resolved using the applicable diagnostic procedure. This assembly restores the assigned separator function; it does not change the engine calibration or provide a performance upgrade.