The 2025 Audi A8 has 14 drivetrain parts with verified fitment on this page — 5 part types and 3 brands, covering both the 3.0L V6 Turbocharged and the 4.0L V8 Turbocharged. Each part includes a manufacturer part number and application notes.
On the 2025 Audi A8, the drivetrain system moves power from transmission to wheels through axles, CV joints, driveshafts, differentials and wheel-end hardware. 12 parts of the 14 listed are Gear Oil (8 parts), CV Joint Boot (3 parts) and CV Axle (1 part). The other 2 part types cover the remaining 2 parts.
The 2025 Audi A8 was sold with both the 3.0L V6 Turbocharged and the 4.0L V8 Turbocharged. Every part on this page is engine-specific. Each part shows which engine(s) it fits.
The most listed brands for 2025 Audi A8 drivetrain parts are VALVOLINE (8 parts), GKN (5 parts) and REIN (1 part).
2 parts on this 2025 Audi A8 page carry a "Popular" badge — the source catalog's flag for options frequently chosen for this vehicle — including VALVOLINE VV982 (Gear Oil) and VALVOLINE VV975 (Gear Oil). Click any part number to see every vehicle that part fits.
CV Axle
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GKN Fits: 3.0L V6 Turbocharged | GKND12332 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Outboard Joint Type: Fix Ball Joint GKN SX | 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.
This group shows a single part: GKN GKND12332.
CV Joint
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GKN Fits: 3.0L V6 Turbocharged | 306277 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Pre-lubricatedThermosplastic Elastomer (TPE) | View on Amazon |
This table covers the constant-velocity joints at each end of a drive axle.
This group shows a single part: GKN 306277.
CV Joint Boot
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GKN Fits: 3.0L V6 Turbocharged | 306177 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | OUTER Diameter 1.220 InThermoplastic Elastomer | View on Amazon |
| GKN Fits: 3.0L V6 Turbocharged | 306188 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | OUTER Diameter 1.063 InThermoplastic Elastomer | View on Amazon |
| REIN Fits: 3.0L V6 Turbocharged | BKN0109 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Front Outer | View on Amazon |
This table covers the boots that keep grease in a CV joint. Typical signs include a split boot, grease flung around the joint, or a click once grit is inside. A boot caught early is a kit. Once the joint has clicked, the joint itself is usually worn.
3 CV Joint Boot parts for the 2025 Audi A8 come from 2 brands — GKN and REIN.
Listed part numbers: GKN 306177, GKN 306188 and REIN BKN0109.
Drive Shaft
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GKN Fits: 3.0L V6 Turbocharged | GKNP20137 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Length 1847mmwith Long Wheelbase | View on Amazon |
This table covers the driveshafts that carry torque from the transmission or transfer case.
One part is listed for the 2025 Audi A8 — GKN GKNP20137.
Gear Oil
SAE 75W-140
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VALVOLINE Popular Fits: 3.0L V6 Turbocharged | VV982 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Advanced Full Synthetic SAE 75W-14 0 Gear Oil1 Quart | View on Amazon |
| VALVOLINE Fits: 3.0L V6 Turbocharged | 889787 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Full Synthetic SAE 75W-14 0 Gear Oil1 Quart Flex Fill | View on Amazon |
| VALVOLINE Fits: 3.0L V6 Turbocharged | 887344 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Advanced Full Synthetic SAE 75W-14 0 Gear Oil1 Gallon | View on Amazon |
| VALVOLINE Fits: 3.0L V6 Turbocharged | 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 Fits: 3.0L V6 Turbocharged | VV975 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Advanced Full Synthetic SAE 75W-90 Gear Oil1 Quart | View on Amazon |
| VALVOLINE Fits: 3.0L V6 Turbocharged | 889785 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Full Synthetic SAE 75W-90 Gear Oil1 Quart Flex Fill | View on Amazon |
| VALVOLINE Fits: 3.0L V6 Turbocharged | 882505 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Advanced Full Synthetic SAE 75W-90 Gear Oil1 Gallon | View on Amazon |
| VALVOLINE Fits: 3.0L V6 Turbocharged | 723856 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Advanced Full Synthetic SAE 75W-90 Gear Oil5 Gallon | View on Amazon |
This table covers the gear oils specified for the axle or transfer case. Typical signs include a low-oil lamp, knocking, or oil that has gone thin before the next interval. Match the viscosity and spec in the notes, not just the weight on the bottle.
8 Gear Oil parts for the 2025 Audi A8 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.
Buying Drivetrain Parts for a 2025 Audi A8
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: Gear Oil and CV Joint Boot .
Frequently Asked Questions
How many drivetrain parts fit the 2025 Audi A8?
Our catalog currently lists 14 drivetrain parts for the 2025 Audi A8 across 5 subcategories and 3 brands, covering both the 3.0L V6 Turbocharged and the 4.0L V8 Turbocharged. Each part is matched to the engine(s) it fits.
Do drivetrain parts differ between 2025 Audi A8 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 A8?
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 A8 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 A8?
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 A8
Drivetrain Parts for Other Audi A8 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.