17 Cooling system parts are listed for the 2025 Audi S8, in 7 part types, covering the 4.0L V8 Turbocharged engine. Each one has a brand, a manufacturer part number and notes that say where it fits.
The cooling system system on the 2025 Audi S8 keeps operating temperature in the narrow band the engine was designed for, from radiator and water pump to thermostat and hoses. The largest groups are Water Pump (8 parts), Temperature Sender / Sensor (4 parts) and Coolant / Antifreeze (1 part). The other 4 part types cover the remaining 4 parts.
The 2025 Audi S8 came with a single engine, the 4.0L V8 Turbocharged, and every part is verified against it.
13 brands supply cooling system parts for the 2025 Audi S8, led by REIN (3 parts), MOTORAD (2 parts) and NISSENS (2 parts), plus 10 more brands. Quality grades include Standard Replacement and Economy.
A "Popular" badge means the source catalog flagged the part as frequently chosen for the 2025 Audi S8. 2 parts have it, including GATES 41568E (Water Pump) and HELLA 358304701 (Water Pump). Each part number opens a page with every vehicle that part fits.
Coolant / Antifreeze
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VALVOLINE | 904683 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | HT-12 Pink1 Gallon | View on Amazon |
This table covers the engine coolants and antifreeze formulations specified for this cooling system. Typical signs include a rising temperature gauge, rusty or sludged coolant, or a heater that blows cold. Use the chemistry named in the notes. Mixing silicate, OAT and HOAT formulas can gel in the radiator.
One part is listed for the 2025 Audi S8 — VALVOLINE 904683.
Coolant Reservoir Cap
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| MOTORAD | T111 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Standard | View on Amazon |
This table covers the caps on the overflow / expansion tank. Typical signs include a leak at the neck, a cap that will not hold pressure, or a missing tether. Match the pressure rating or thread in the notes — radiator, reservoir and fuel caps are not interchangeable.
This group shows a single part: MOTORAD T111.
Radiator Insulator Sleeve
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| REIN | AVM0730 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon |
This table covers the Radiator Insulator sleeves.
This group shows a single part: REIN AVM0730.
Radiator Mount
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| REIN | AVM0729 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Upper | View on Amazon |
This table covers the Radiator mounts. Typical signs include a clunk on takeoff, a vibration at idle, or a separated rubber insert. Support the powertrain before unbolting a mount, and torque the fasteners in the notes.
This group shows a single part: REIN AVM0729.
Temperature Sender / Sensor
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| NISSENS | 207067 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Oval Connector, bolted connection | View on Amazon |
| STANDARD MOTOR PRODUCTS | TX336 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon | |
| VNE | 9418050 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon | |
| WALKER PRODUCTS | 2112035 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Sensor Only | View on Amazon |
This table covers the senders that report coolant temperature to the gauge or ECU. Typical signs include a gauge that sits on empty or overheat, or a lamp that does not match what the engine is doing. Rule out the cluster and the wiring before replacing the sender.
4 Temperature Sender / Sensor parts are listed for the 2025 Audi S8, from NISSENS, STANDARD MOTOR PRODUCTS, VNE and 1 other brand.
This group includes NISSENS 207067, STANDARD MOTOR PRODUCTS TX336 and VNE 9418050 and the remaining parts above.
Thermostat
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| MOTORAD | 1331225 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Includes housings, sensor, seal | View on Amazon |
This table covers the thermostats that open the coolant circuit at the specified temperature. Typical signs include slow warm-up, a gauge that climbs in traffic, or heat that never quite arrives. Replace the housing gasket with the thermostat and bleed the system so a trapped air pocket does not cook the new part.
This group shows a single part: MOTORAD 1331225.
Water Pump
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| REIN | WPA0541 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Auxiliary | View on Amazon |
| VAICO | V4550019 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GATES Popular | 41568E | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Electric | View on Amazon |
| FOUR SEASONS | 89084 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Auxiliary | View on Amazon |
| GMB | 1804050 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon | |
| NISSENS | 832121 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Alternator CoolingAuxiliary | View on Amazon |
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| HELLA Popular | 358304701 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | AlternatorAuxiliary | View on Amazon |
| FVP | 1804050 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Impeller Rotation: Counter-Clockwise | View on Amazon |
This table covers the pumps that circulate coolant through the block and radiator. Typical signs include coolant at the weep hole, pulley play, or a growl from the front of the engine. Replace the thermostat and refill with the specified coolant whenever the pump comes off.
8 Water Pump parts for the 2025 Audi S8 come from 8 brands — REIN, VAICO, GATES and 5 other brands. The "Popular" part is GATES 41568E.
The Economy section lists 2 options from REIN and VAICO — the catalog's value-priced group. REIN WPA0541 is listed in this group.
In the Standard Replacement grade, GATES, FOUR SEASONS, GMB and 1 other brand supply 4 parts: built to original-equipment specification. A representative part number is GATES 41568E.
2 further parts sit outside the graded sections, with the same engine-level match.
This group includes GATES 41568E, REIN WPA0541 and VAICO V4550019 and the remaining parts above.
Buying Cooling System Parts for a 2025 Audi S8
On this vehicle, the cooling system system keeps operating temperature in the narrow band the engine was designed for, from radiator and water pump to thermostat and hoses.
- Confirm you have the 4.0L V8 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 thermostat and refill with fresh coolant whenever you change a water pump or radiator; original hoses on an older vehicle are on borrowed time.
- Cross-reference the manufacturer part number against your old part or a service-manual listing.
Start with the largest groups on this page: Water Pump and Temperature Sender / Sensor .
Frequently Asked Questions
How many cooling system parts fit the 2025 Audi S8?
Our catalog currently lists 17 cooling system parts for the 2025 Audi S8 across 7 subcategories and 13 brands, covering the 4.0L V8 Turbocharged engine. Each part is matched to the engine(s) it fits.
What are the signs of cooling system problems on a 2025 Audi S8?
Common symptoms include a rising temperature gauge in traffic, sweet-smelling steam, crusty deposits around hose clamps, or a heater that blows cold. 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 thermostat and refill with fresh coolant whenever you change a water pump or radiator; original hoses on an older vehicle are on borrowed time.
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 S8 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 S8?
Every part on this page is matched to the 4.0L V8 Turbocharged engine. Then replace coolant with the exact specification the manufacturer calls for — mixing chemistries can gel and block small passages. The notes column carries position and trim qualifiers where they apply.
Other Parts for the 2025 Audi S8
Cooling System Parts for Other Audi S8 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.