This page lists 11 drivetrain parts for the 2025 Audi A3, across 4 part types, covering both the 1.4L L4 Turbocharged and the 2.0L L4 Turbocharged. Every part shows its brand, manufacturer part number and fitment notes.
The drivetrain system on the 2025 Audi A3 moves power from transmission to wheels through axles, CV joints, driveshafts, differentials and wheel-end hardware. The largest groups are Transfer Case Fluid (7 parts), Differential Seal (2 parts) and AWD Coupling Fluid (1 part). The other 1 part type covers the remaining 1 part.
The 2025 Audi A3 was sold with both the 1.4L L4 Turbocharged and the 2.0L L4 Turbocharged. Every part on this page is engine-specific. Each part shows which engine(s) it fits.
4 brands supply drivetrain parts for the 2025 Audi A3, led by VALVOLINE (4 parts), ELRING (3 parts) and VAICO (3 parts), plus 1 more brand.
A "Popular" badge means the source catalog flagged the part as frequently chosen for the 2025 Audi A3. 2 parts have it, including VALVOLINE VV975 (Transfer Case Fluid) and VALVOLINE 889785 (Transfer Case Fluid). Each part number opens a page with every vehicle that part fits.
AWD Coupling Fluid
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| REIN Fits: 2.0L L4 Turbocharged | FLDF003 | 🇺🇸 US 🇨🇦 CA | Haldex850 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.
One part is listed for the 2025 Audi A3 — REIN FLDF003.
Differential Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ELRING Fits: 2.0L L4 Turbocharged | 877460 | 🇲🇽 MX | Dust Cover: without dust LipSwirl Type: Alternating Twist | View on Amazon |
| ELRING Fits: 2.0L L4 Turbocharged | 871180 | 🇲🇽 MX | Dust Cover: with dust LipInner Diameter [MM]: 67 | View on Amazon |
This table covers the seals at the Differential. Typical signs include a wet housing, a drip after sitting, or fluid flung off a rotating shaft. Fix the surface the seal rides on. A new seal on a grooved shaft will leak again.
2 Differential Seal parts for the 2025 Audi A3 come from ELRING.
This group includes ELRING 877460 and ELRING 871180.
Transfer Case Fluid
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VALVOLINE Popular Fits: 2.0L L4 Turbocharged | VV975 | 🇺🇸 US 🇨🇦 CA | Advanced Full Synthetic SAE 75W-90 Gear Oil1 Quart | View on Amazon |
| VALVOLINE Popular Fits: 2.0L L4 Turbocharged | 889785 | 🇺🇸 US 🇨🇦 CA | Full Synthetic SAE 75W-90 Gear Oil1 Quart Flex Fill | View on Amazon |
| VAICO Fits: 2.0L L4 Turbocharged | V600430 | 🇺🇸 US 🇨🇦 CA | Transfer Case Oil DTF-1 L | View on Amazon |
| VAICO Fits: 2.0L L4 Turbocharged | V600431 | 🇺🇸 US 🇨🇦 CA | Grade: AMTransfer Case Fluid, DTF-1 - 5 Liter | View on Amazon |
| VAICO Fits: 2.0L L4 Turbocharged | V600432 | 🇺🇸 US 🇨🇦 CA | Grade: OEMTransfer Case Oil DTF-1-20 L | View on Amazon |
| VALVOLINE Fits: 2.0L L4 Turbocharged | 882505 | 🇺🇸 US 🇨🇦 CA | Advanced Full Synthetic SAE 75W-90 Gear Oil1 Gallon | View on Amazon |
| VALVOLINE Fits: 2.0L L4 Turbocharged | 723856 | 🇺🇸 US 🇨🇦 CA | Advanced Full Synthetic SAE 75W-90 Gear Oil5 Gallon | View on Amazon |
This table covers the fluids specified for the transfer case. 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.
7 Transfer Case Fluid parts are listed for the 2025 Audi A3, from VALVOLINE and VAICO. VALVOLINE VV975 carries the "Popular" badge.
Part numbers include VALVOLINE VV975, VALVOLINE 889785 and VAICO V600430, among others listed above.
Transfer Case Input Shaft Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ELRING Fits: 2.0L L4 Turbocharged | 871070 | 🇲🇽 MX | Swirl Type: Left-hand Twist | View on Amazon |
This table covers the seals at the Transfer Case Input Shaft. Typical signs include a wet housing, a drip after sitting, or fluid flung off a rotating shaft. Fix the surface the seal rides on. A new seal on a grooved shaft will leak again.
This group shows a single part: ELRING 871070.
Buying Drivetrain Parts for a 2025 Audi A3
On this vehicle, the drivetrain system moves power from transmission to wheels through axles, CV joints, driveshafts, differentials and wheel-end hardware.
- Match the engine first. Every drivetrain part here is engine-specific; each row shows which engine(s) it fits.
- 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: Transfer Case Fluid and Differential Seal .
Frequently Asked Questions
How many drivetrain parts fit the 2025 Audi A3?
Our catalog currently lists 11 drivetrain parts for the 2025 Audi A3 across 4 subcategories and 4 brands, covering both the 1.4L L4 Turbocharged and the 2.0L L4 Turbocharged. Each part is matched to the engine(s) it fits.
Do drivetrain parts differ between 2025 Audi A3 engines?
Yes. Every drivetrain part on this page is engine-specific. Each row shows which engine(s) it fits — use the filter at the top to hide the rest. If you're unsure which engine you have, check the emissions label under the hood or the 8th character of your VIN.
What are the signs of drivetrain problems on a 2025 Audi A3?
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 2025 Audi A3 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 2025 Audi A3?
First match the engine — each row shows which engine(s) the part fits. 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 2025 Audi A3
Drivetrain Parts for Other Audi A3 Years
Switch vehicle or jump to a subcategory
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.