This page lists 12 drivetrain parts for the 2018 Audi S3, across 5 part types, covering the 2.0L L4 Turbocharged engine. Every part shows its brand, manufacturer part number and fitment notes.
On the 2018 Audi S3, the drivetrain system moves power from transmission to wheels through axles, CV joints, driveshafts, differentials and wheel-end hardware. 10 parts of the 12 listed are AWD Coupling Oil Pump (7 parts), AWD Coupling Fluid (2 parts) and 4WD Actuator (1 part). The other 2 part types cover the remaining 2 parts.
The 2018 Audi S3 came with a single engine, the 2.0L L4 Turbocharged, and every part is verified against it.
3 brands supply drivetrain parts for the 2018 Audi S3, led by VAICO (10 parts), REIN (1 part) and DORMAN (1 part).
A "Popular" badge means the source catalog flagged the part as frequently chosen for the 2018 Audi S3. 2 parts have it, including VAICO V106603XXL (AWD Coupling Oil Pump) and VAICO V106592 (AWD Coupling Oil Pump). Each part number opens a page with every vehicle that part fits.
4WD Actuator
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VAICO | V108958 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Grade: Q+ | View on Amazon |
This table covers the actuators that engage four-wheel drive at the transfer case or axle. Typical signs include a door or range that will not move, or a click with no motion. Confirm the command signal before replacing the actuator — a failed module looks the same.
This group shows a single part: VAICO V108958.
AWD Coupling Fluid
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| REIN | FLDF003 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Haldex850 ml | View on Amazon |
| VAICO | V600450 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Differential Oil, 850 ML | View on Amazon |
This table covers the AWD Coupling fluids. Typical signs include discolored fluid, a burnt smell, or a level that keeps dropping. Use only the specification in the notes — the tables group grades because they are not interchangeable.
2 AWD Coupling Fluid parts are listed for the 2018 Audi S3, from REIN and VAICO.
Part numbers include REIN FLDF003 and VAICO V600450.
AWD Coupling Oil Filter
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VAICO | V106662 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon |
This table covers the AWD Coupling Oil filters. Typical signs include restricted flow — long cranking, weak airflow, or dirty fluid after a short interval. Seat the new filter so it cannot bypass, and use the grade the notes call for.
One part is listed for the 2018 Audi S3 — VAICO V106662.
AWD Coupling Oil Pump
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VAICO Popular | V106603XXL | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | 850mlTransmission Code: KJU, KMD, KMC, MMK, JJN, JUY, MML | View on Amazon |
| VAICO Popular | V106592 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon | |
| VAICO | V106603 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Includes: Oil drain plugs | View on Amazon |
| VAICO | V105600 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | with Haldex Oil850ml | View on Amazon |
| VAICO | V106827 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Includes: Pump, Oil drain plugs, Complete Kit | View on Amazon |
| VAICO | V106826 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Complete KitIncludes: Pump, Oil, Screws | View on Amazon |
| VAICO | V105600XXL | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Includes: Hydraulic Filter, Hydraulic Oil, Drain Plugs, Seal Ring, Gasket-Set | View on Amazon |
This table covers the AWD Coupling Oil pumps. Typical signs include noise from the pump, no pressure, or fluid that never arrives at the outlet. Prime or fill the pump as the notes require. A dry start is a common way to kill a new unit.
VAICO supplies the 7 AWD Coupling Oil Pump parts for the 2018 Audi S3. VAICO V106603XXL carries the "Popular" badge.
Listed part numbers: VAICO V106603XXL, VAICO V106592 and VAICO V106603, plus the other parts above.
Axle Bolt
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DORMAN | 6150061 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | FrontNon-Ribbed Version | View on Amazon |
This table covers the Axle bolts.
One part is listed for the 2018 Audi S3 — DORMAN 6150061.
Buying Drivetrain Parts for a 2018 Audi S3
On this vehicle, the drivetrain system moves power from transmission to wheels through axles, CV joints, driveshafts, differentials and wheel-end hardware.
- Confirm you have the 2.0L L4 Turbocharged engine — every part on this page is matched to it.
- Read the notes on each row for position, trim and spec qualifiers before you order.
- Where labor overlaps, replace the differential or transfer-case fluid with any axle or seal job while everything is already open.
- Cross-reference the manufacturer part number against your old part or a service-manual listing.
Start with the largest groups on this page: AWD Coupling Oil Pump and AWD Coupling Fluid .
Frequently Asked Questions
How many drivetrain parts fit the 2018 Audi S3?
Our catalog currently lists 12 drivetrain parts for the 2018 Audi S3 across 5 subcategories and 3 brands, covering the 2.0L L4 Turbocharged engine. Each part is matched to the engine(s) it fits.
What are the signs of drivetrain problems on a 2018 Audi S3?
Common symptoms include clicking in tight turns, a clunk when shifting between drive and reverse, vibration that builds with speed, or gear oil on the inside of a wheel. If you notice any of these, identify the affected subcategory above and cross-reference the part numbers listed.
What should I replace at the same time?
Where labor overlaps, replace the differential or transfer-case fluid with any axle or seal job while everything is already open.
What do the market flags (US, CA, MX) on each part mean?
They show the market for which the manufacturer published application data for that part — where the vehicle was first sold, not where the part was made. If your 2018 Audi S3 was originally sold in the US, the safest choice is a part marked for the US market.
How do I make sure a part fits my 2018 Audi S3?
Every part on this page is matched to the 2.0L L4 Turbocharged engine. Then a torn CV boot caught early is a cheap boot kit; caught late it is a whole axle — inspect before deciding which to buy. The notes column carries position and trim qualifiers where they apply.
Other Parts for the 2018 Audi S3
Drivetrain Parts for Other Audi S3 Years
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Manufacturer names, model designations and part numbers are used for identification and fitment reference only. AutoFactsDB is an independent catalog and is not affiliated with, endorsed by, or sponsored by any vehicle manufacturer displayed on this page.