This page lists 22 engine parts for the 2018 Audi A8, across 14 part types, covering all 3 engine options (3.0L V6 Supercharged, 4.0L V8 Turbocharged and 6.3L W12). Every part shows its brand, manufacturer part number and fitment notes.
The engine on the 2018 Audi A8 covers the internals and hard parts that build compression and keep oil where it belongs — gaskets, bearings, camshafts, lifters, seals and timing components. The largest groups are Cylinder Head Gasket (4 parts), Oil (4 parts) and Crankshaft Seal (2 parts). The other 11 part types cover the remaining 12 parts.
The 2018 Audi A8 was sold with 3 engines. Every part on this page is engine-specific. Each part shows which engine(s) it fits.
The most listed brands for 2018 Audi A8 engine parts are AJUSA (16 parts), VAICO (2 parts) and VALVOLINE (2 parts), plus 2 more brands.
Each part number listed for the 2018 Audi A8 opens a page with every vehicle that part fits.
Conversion / Lower Gasket Set
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| AJUSA Fits: 6.3L W12 | 54319600 | 🇲🇽 MX | Engine # CTNA | View on Amazon |
This table covers lower / conversion gasket sets for oil-pan and related joints. Typical signs include the leaks that sent the engine or gearbox to the bench. Use every gasket the set is meant for that opening — leftover unused pieces usually belong to another configuration.
This group shows a single part: AJUSA 54319600.
Crankshaft Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| AJUSA Fits: 6.3L W12 | 15085100 | 🇲🇽 MX | Rear85 X 105 X 11 | View on Amazon |
| AJUSA Fits: 6.3L W12 | 15124300 | 🇲🇽 MX | FrontClockwise | 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.
AJUSA supplies both parts for the 2018 Audi A8.
This group includes AJUSA 15085100 and AJUSA 15124300.
Cylinder Head Bolt
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| AJUSA Fits: 6.3L W12 | 81081400 | 🇲🇽 MX | Engine # CTNA | View on Amazon |
This table covers the bolts that clamp the cylinder head to the block.
This group shows a single part: AJUSA 81081400.
Cylinder Head Gasket
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| AJUSA Fits: 6.3L W12 | 10259300 | 🇲🇽 MX | Multi Layered Steel | View on Amazon |
| AJUSA Fits: 6.3L W12 | 10259400 | 🇲🇽 MX | Multi Layered Steel | View on Amazon |
| AJUSA Fits: 6.3L W12 | 52599000 | 🇲🇽 MX | RightEngine # CTNA | View on Amazon |
| AJUSA Fits: 6.3L W12 | 52599100 | 🇲🇽 MX | LeftEngine # CTNA | View on Amazon |
This table covers the head gaskets that seal the block to the cylinder head. Typical signs include seepage at the joint, a burnt-oil smell, or a leak that appears only after a long drive. Clean both flanges and torque in the sequence the notes or the manual call for.
4 Cylinder Head Gasket parts for the 2018 Audi A8 come from AJUSA.
Part numbers include AJUSA 10259300, AJUSA 10259400 and AJUSA 52599000, among others listed above.
Cylinder Head Gasket Set
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| AJUSA Fits: 6.3L W12 | 52598900 | 🇲🇽 MX | Complete Set | View on Amazon |
This table covers multi-piece gasket sets for a cylinder-head job. Typical signs include the leaks that sent the engine or gearbox to the bench. Use every gasket the set is meant for that opening — leftover unused pieces usually belong to another configuration.
This group shows a single part: AJUSA 52598900.
Engine Kit Gasket Set
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| AJUSA Fits: 6.3L W12 | 50545600 | 🇲🇽 MX | Engine # CTNA | View on Amazon |
This table covers full gasket kits covering the joints opened in an engine rebuild. Typical signs include the leaks that sent the engine or gearbox to the bench. Use every gasket the set is meant for that opening — leftover unused pieces usually belong to another configuration.
This group shows a single part: AJUSA 50545600.
Intake Manifold Gasket
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| AJUSA Fits: 6.3L W12 | 13326900 | 🇲🇽 MX | RightEngine # CTNA | View on Amazon |
| AJUSA Fits: 6.3L W12 | 13327000 | 🇲🇽 MX | LeftEngine # CTNA | View on Amazon |
This table covers the gaskets between the intake manifold and the cylinder head. Typical signs include seepage at the joint, a burnt-oil smell, or a leak that appears only after a long drive. Clean both flanges and torque in the sequence the notes or the manual call for.
2 Intake Manifold Gasket parts for the 2018 Audi A8 come from AJUSA.
Part numbers include AJUSA 13326900 and AJUSA 13327000.
Oil
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VAICO Fits: 6.3L W12 | V600422 | 🇲🇽 MX | Description: Engine Oil SAE 5W-40 C3 1 L | View on Amazon |
| VAICO Fits: 6.3L W12 | V600423 | 🇲🇽 MX | Description: Engine Oil SAE 5W-40 C3 4 L | View on Amazon |
| VALVOLINE Fits: 6.3L W12 | 881167 | 🇲🇽 MX | European Vehicle Full Synthetic XL-III SAE 5W-30Easy Pour 5 Quart | View on Amazon |
| VALVOLINE Fits: 6.3L W12 | 881058 | 🇲🇽 MX | European Vehicle Full Synthetic XL-III SAE 5W-305 Gallon Bay Box | 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.
4 Oil parts are listed for the 2018 Audi A8, from VAICO and VALVOLINE.
Listed part numbers: VAICO V600422, VAICO V600423 and VALVOLINE 881167, plus the other parts above.
Oil Drain Plug
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DORMAN Fits: 6.3L W12 | 921131 | 🇲🇽 MX | StandardM14-1.50, Head Size 17MM | View on Amazon |
This table covers the drain plugs in the oil pan.
One part is listed for the 2018 Audi A8 — DORMAN 921131.
Oil Drain Plug Gasket
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| AJUSA Fits: 6.3L W12 | 18001000 | 🇲🇽 MX | Engine # CTNA | View on Amazon |
This table covers the crush washers and gaskets under the oil drain plug. Typical signs include seepage at the joint, a burnt-oil smell, or a leak that appears only after a long drive. Clean both flanges and torque in the sequence the notes or the manual call for.
This group shows a single part: AJUSA 18001000.
Oil Filter
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VARIOUS MFR Fits: 6.3L W12 | PG5890 | 🇲🇽 MX | View on Amazon |
This table covers the oil filters that screw onto this engine's filter mount. Typical signs include low oil pressure after a service, or a filter that will not spin off because the old gasket stayed on the block. Lube the new gasket and tighten to the spec on the box; a double-gasket install dumps the sump on the first drive.
One part is listed for the 2018 Audi A8 — VARIOUS MFR PG5890.
Oil Pump Pickup Tube O-Ring
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| AJUSA Fits: 6.3L W12 | 16010800 | 🇲🇽 MX | Engine # CTNA | View on Amazon |
This table covers the O-rings that seal the oil-pump pickup tube. 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 2018 Audi A8 — AJUSA 16010800.
Valve Lifter
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| AJUSA Fits: 6.3L W12 | 85009000 | 🇲🇽 MX | Engine # CTNA | View on Amazon |
This table covers the lifters / tappets that transfer cam motion to the valves.
One part is listed for the 2018 Audi A8 — AJUSA 85009000.
Valve Stem Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| AJUSA Fits: 6.3L W12 | 57092700 | 🇲🇽 MX | Engine # CTNA | 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 2018 Audi A8 — AJUSA 57092700.
Buying Engine Parts for a 2018 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: Cylinder Head Gasket and Oil .
Frequently Asked Questions
How many engine parts fit the 2018 Audi A8?
Our catalog currently lists 22 engine parts for the 2018 Audi A8 across 14 subcategories and 5 brands, covering all 3 engine options (3.0L V6 Supercharged, 4.0L V8 Turbocharged and 6.3L W12). Each part is matched to the engine(s) it fits.
Do engine parts differ between 2018 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 2018 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 2018 Audi A8?
Oil rows on this page include SAE 5W-30 and 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 2018 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 2018 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 2018 Audi A8
Engine Parts for Other Audi A8 Years
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