The 2018 Audi A4 has 24 drivetrain parts with verified fitment on this page — 4 part types and 6 brands, covering the 2.0L L4 Turbocharged engine. Each part includes a manufacturer part number and application notes.
On the 2018 Audi A4, the drivetrain system moves power from transmission to wheels through axles, CV joints, driveshafts, differentials and wheel-end hardware. 23 parts of the 24 listed are CV Axle (12 parts), AWD Coupling Fluid (8 parts) and Axle Shaft Seal (3 parts). The other 1 part type covers the remaining 1 part.
Every part on this page is matched to the 2.0L L4 Turbocharged — the only engine offered in the 2018 Audi A4.
The most listed brands for 2018 Audi A4 drivetrain parts are VALVOLINE (8 parts), TOP NOTCH (5 parts) and GSP (4 parts), plus 3 more brands. Quality grades include Standard Replacement and Premium.
5 parts on this 2018 Audi A4 page carry a "Popular" badge — the source catalog's flag for options frequently chosen for this vehicle — including VALVOLINE VV982 (AWD Coupling Fluid) and TOP NOTCH TN19007PR (CV Axle). Click any part number to see every vehicle that part fits.
AWD Coupling Fluid
SAE 75W-140
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VALVOLINE Popular | VV982 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Advanced Full Synthetic SAE 75W-14 0 Gear Oil1 Quart | View on Amazon |
| VALVOLINE | 889787 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Full Synthetic SAE 75W-14 0 Gear Oil1 Quart Flex Fill | View on Amazon |
| VALVOLINE | 887344 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Advanced Full Synthetic SAE 75W-14 0 Gear Oil1 Gallon | View on Amazon |
| VALVOLINE | VV981 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Advanced Full Synthetic SAE 75W-14 0 Gear Oil5 Gallon | View on Amazon |
SAE 75W-90
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VALVOLINE Popular | VV975 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Advanced Full Synthetic SAE 75W-90 Gear Oil1 Quart | View on Amazon |
| VALVOLINE | 889785 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Full Synthetic SAE 75W-90 Gear Oil1 Quart Flex Fill | View on Amazon |
| VALVOLINE | 882505 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Advanced Full Synthetic SAE 75W-90 Gear Oil1 Gallon | View on Amazon |
| VALVOLINE | 723856 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Advanced Full Synthetic SAE 75W-90 Gear Oil5 Gallon | 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.
8 AWD Coupling Fluid parts for the 2018 Audi A4 come from VALVOLINE. The "Popular" part is VALVOLINE VV982.
The SAE 75W-140 section lists 4 options from VALVOLINE — grouped under the catalog's "SAE 75W-140" designation — the notes column spells out what sets them apart. VALVOLINE VV982 is listed in this group.
The SAE 75W-90 section lists 4 options from VALVOLINE — grouped under the catalog's "SAE 75W-90" designation — the notes column spells out what sets them apart. VALVOLINE VV975 is listed in this group.
Listed part numbers: VALVOLINE VV982, VALVOLINE 889787 and VALVOLINE 887344, plus the other parts above.
Axle Shaft Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| TIMKEN | SL260517 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | RearA4 Quattro | View on Amazon |
| TIMKEN | SL260526 | 🇺🇸 US 🇨🇦 CA | Rear LeftManual trans. | View on Amazon |
| TIMKEN | SL260529 | 🇺🇸 US 🇨🇦 CA | Rear RightManual trans. | View on Amazon |
This table covers the seals where an axle shaft exits the housing. 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.
3 Axle Shaft Seal parts for the 2018 Audi A4 come from TIMKEN.
Part numbers include TIMKEN SL260517, TIMKEN SL260526 and TIMKEN SL260529.
CV Axle
Premium
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| TOP NOTCH Popular | TN19007PR | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Performance | View on Amazon |
| GSP | PR23025 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Performance Revolution | View on Amazon |
| TOP NOTCH | TN19019PR | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Performance | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| TOP NOTCH Popular | TN19007 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | FrontA4 Base Model | View on Amazon |
| TOP NOTCH Popular | TN19019 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | FrontA4 Quattro | View on Amazon |
| GSP | NCV23011 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | FrontA4 Base Model | View on Amazon |
| GSP | NCV23028 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | RearA4 Quattro | View on Amazon |
| GSP | NCV23025 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | FrontA4 Quattro | View on Amazon |
| TOP NOTCH | TN19022 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | RearA4 Quattro | View on Amazon |
| TRAKMOTIVE | AD8173 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Rear | View on Amazon |
| TRAKMOTIVE | AD8170 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | AAR Joint Design | View on Amazon |
| TRAKMOTIVE | AD8169 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | AAR Joint Design | View on Amazon |
This table covers the complete CV axle shafts from differential (or hub) to wheel. Typical signs include a click in tight turns, grease flung around the wheel well, or a vibration that builds with speed. A torn boot caught early is a boot kit; caught late it is the whole axle. Torque the axle nut to the method in the notes.
12 CV Axle parts for the 2018 Audi A4 come from 3 brands — TOP NOTCH, GSP and TRAKMOTIVE. The "Popular" part is TOP NOTCH TN19007PR.
In the Premium grade, TOP NOTCH and GSP supply 3 parts: a step above OE specification in materials, tolerances or warranty terms. A representative part number is TOP NOTCH TN19007PR.
In the Standard Replacement grade, TOP NOTCH, GSP and TRAKMOTIVE supply 9 parts: built to original-equipment specification. A representative part number is TOP NOTCH TN19007.
CV Joint
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VAICO | V107738 | 🇺🇸 US | Fits InnerA4 Base Model | View on Amazon |
This table covers the constant-velocity joints at each end of a drive axle.
This group shows a single part: VAICO V107738.
Buying Drivetrain Parts for a 2018 Audi A4
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: CV Axle and AWD Coupling Fluid .
Frequently Asked Questions
How many drivetrain parts fit the 2018 Audi A4?
Our catalog currently lists 24 drivetrain parts for the 2018 Audi A4 across 4 subcategories and 6 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 A4?
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 A4 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 A4?
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 A4
Drivetrain Parts for Other Audi A4 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.