This page lists 6 engine parts for the 2025 Audi A8, across 5 part types, covering both the 3.0L V6 Turbocharged and the 4.0L V8 Turbocharged. Every part shows its brand, manufacturer part number and fitment notes.
On the 2025 Audi A8, the engine covers the internals and hard parts that build compression and keep oil where it belongs — gaskets, bearings, camshafts, lifters, seals and timing components. 4 parts of the 6 listed are Oil Drain Plug (2 parts), Crankshaft Seal (1 part) and Oil (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 engine parts are MAHLE / CLEVITE (2 parts), REIN (2 parts) and VAICO (1 part), plus 1 more brand.
Each part number listed for the 2025 Audi A8 opens a page with every vehicle that part fits.
Crankshaft Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| MAHLE / CLEVITE Fits: 4.0L V8 Turbocharged | 67830 | 🇲🇽 MX | PTFE (Polytetrafluoroethylene) | View on Amazon |
This table covers the front and rear seals that keep oil in at the crankshaft. 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.
One part is listed for the 2025 Audi A8 — MAHLE / CLEVITE 67830.
Oil
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VAICO Fits: 4.0L V8 Turbocharged | V600423 | 🇲🇽 MX | Description: Engine Oil SAE 5W-40 C3 4 L | View on Amazon |
This table covers the engine oils listed by grade and specification for this engine. Typical signs include a low-oil lamp, knocking after a long interval, or oil that has gone thin and black well before the next service. Match the viscosity and spec in the notes (and on the filler cap). The tables group grades — they are not interchangeable.
One part is listed for the 2025 Audi A8 — VAICO V600423.
Oil Drain Plug
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| REIN Fits: 4.0L V8 Turbocharged | HWP1014 | 🇲🇽 MX | Steel | View on Amazon |
| REIN Fits: 4.0L V8 Turbocharged | HWU1014 | 🇲🇽 MX | Aluminum | View on Amazon |
This table covers the drain plugs in the oil pan.
REIN supplies both parts for the 2025 Audi A8.
Listed part numbers: REIN HWP1014 and REIN HWU1014.
Oil Level Sensor Gasket / O-Ring
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| AJUSA Fits: 4.0L V8 Turbocharged | 01899000 | 🇲🇽 MX | View on Amazon |
This table covers the Oil Level Sensor Gasket O-rings. Typical signs include a seep at a fitting or a housing that weeps after a service. Lube the new O-ring with the fluid it will see, and do not roll it into the groove.
One part is listed for the 2025 Audi A8 — AJUSA 01899000.
Valve Stem Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| MAHLE / CLEVITE Fits: 4.0L V8 Turbocharged | SS45940A | 🇲🇽 MX | Fluoroelastomer | View on Amazon |
This table covers the seals on each valve stem that control oil into the guides. 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.
One part is listed for the 2025 Audi A8 — MAHLE / CLEVITE SS45940A.
Buying Engine Parts for a 2025 Audi A8
On this vehicle, the engine covers the internals and hard parts that build compression and keep oil where it belongs — gaskets, bearings, camshafts, lifters, seals and timing components.
- Match the engine first. Every engine 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 seals and gaskets for anything you open up; a timing job should always include the tensioner and guides, not just the belt or chain.
- Cross-reference the manufacturer part number against your old part or a service-manual listing.
Start with the largest groups on this page: Oil Drain Plug and Crankshaft Seal .
Frequently Asked Questions
How many engine parts fit the 2025 Audi A8?
Our catalog currently lists 6 engine parts for the 2025 Audi A8 across 5 subcategories and 4 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 engine parts differ between 2025 Audi A8 engines?
Yes. Every engine 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 engine problems on a 2025 Audi A8?
Common symptoms include oil spots under the vehicle, blue or white exhaust smoke, ticking from the valvetrain, or coolant mysteriously disappearing. If you notice any of these, identify the affected subcategory above and cross-reference the part numbers listed.
What oil viscosity is listed for the 2025 Audi A8?
Oil rows on this page include SAE 5W-40. Confirm the engine and the weight on the filler cap before you buy — high-mileage and standard fills can differ.
What should I replace at the same time?
Where labor overlaps, replace the seals and gaskets for anything you open up; a timing job should always include the tensioner and guides, not just the belt or chain.
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 engine hard parts are unforgiving of guesswork — confirm the casting or engine code before ordering, because one model year can hide two different blocks. The notes column carries position and trim qualifiers where they apply.
Other Parts for the 2025 Audi A8
Engine 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.