44 Drivetrain parts are listed for the 2018 Audi TT, in 12 part types, covering all 3 engine options (1.8L L4 Turbocharged, 2.0L L4 Turbocharged and 2.5L L5 Turbocharged). Each one has a brand, a manufacturer part number and notes that say where it fits.
The drivetrain system on the 2018 Audi TT moves power from transmission to wheels through axles, CV joints, driveshafts, differentials and wheel-end hardware. The largest groups are Transfer Case Fluid (9 parts), Gear Oil (8 parts) and AWD Coupling Oil Pump (7 parts). The other 9 part types cover the remaining 20 parts.
The 2018 Audi TT was sold with 3 engines. Every part on this page is engine-specific. Each part shows which engine(s) it fits.
11 brands supply drivetrain parts for the 2018 Audi TT, led by VAICO (14 parts), VALVOLINE (14 parts) and GKN (5 parts), plus 8 more brands.
A "Popular" badge means the source catalog flagged the part as frequently chosen for the 2018 Audi TT. 7 parts have it, including VAICO V106603XXL (AWD Coupling Oil Pump) and APWI AD8383 (CV Axle). Each part number opens a page with every vehicle that part fits.
AWD Coupling Fluid
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| REIN Fits: 2.5L L5 Turbocharged | FLDF003 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Haldex850 ml | View on Amazon |
| VAICO Fits: 2.5L L5 Turbocharged | V600450 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Differential Oil, 850 ML | 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.
2 AWD Coupling Fluid parts are listed for the 2018 Audi TT, from REIN and VAICO.
Part numbers include REIN FLDF003 and VAICO V600450.
AWD Coupling Oil Filter
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VAICO Fits: 1.8L L4 Turbocharged, 2.5L L5 Turbocharged | V106662 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon |
This table covers the AWD Coupling Oil filters. Typical signs include restricted flow — long cranking, weak airflow, or dirty fluid after a short interval. Seat the new filter so it cannot bypass, and use the grade the notes call for.
One part is listed for the 2018 Audi TT — VAICO V106662.
AWD Coupling Oil Pump
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VAICO Popular Fits: 2.5L L5 Turbocharged | V106603XXL | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | 850mlTransmission Code: KJU, KMD, KMC, MMK, JJN, JUY, MML | View on Amazon |
| VAICO Popular Fits: 2.5L L5 Turbocharged | V106592 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Rear | View on Amazon |
| VAICO Fits: 2.5L L5 Turbocharged | V106603 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Includes: Oil drain plugs | View on Amazon |
| VAICO Fits: 2.5L L5 Turbocharged | V105600 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | with Haldex Oil850ml | View on Amazon |
| VAICO Fits: 2.5L L5 Turbocharged | V106827 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Includes: Pump, Oil drain plugs, Complete Kit | View on Amazon |
| VAICO Fits: 2.5L L5 Turbocharged | V106826 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Complete KitIncludes: Pump, Oil, Screws | View on Amazon |
| VAICO Fits: 2.5L L5 Turbocharged | V105600XXL | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Includes: Hydraulic Filter, Hydraulic Oil, Drain Plugs, Seal Ring, Gasket-Set | View on Amazon |
This table covers the AWD Coupling Oil pumps. Typical signs include noise from the pump, no pressure, or fluid that never arrives at the outlet. Prime or fill the pump as the notes require. A dry start is a common way to kill a new unit.
VAICO supplies the 7 AWD Coupling Oil Pump parts for the 2018 Audi TT. VAICO V106603XXL carries the "Popular" badge.
This group includes VAICO V106603XXL, VAICO V106592 and VAICO V106603 and the remaining parts above.
Axle Bolt
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DORMAN Fits: 1.8L L4 Turbocharged | 6150061 | 🇲🇽 MX | FrontNon-Ribbed Version | View on Amazon |
This table covers the Axle bolts.
One part is listed for the 2018 Audi TT — DORMAN 6150061.
CV Axle
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| APWI Popular Fits: 2.5L L5 Turbocharged | AD8383 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Front Right | View on Amazon |
| GKN Fits: 2.5L L5 Turbocharged | 305771 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Fits Front RightLength 603 mm | View on Amazon |
| GKN Fits: 2.5L L5 Turbocharged | 306629 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Front LeftLength 561 mm | View on Amazon |
| GSP Fits: 2.5L L5 Turbocharged | NCV23046 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Front Right | View on Amazon |
| TOP NOTCH Fits: 2.5L L5 Turbocharged | TN19034 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Front Right | 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.
5 CV Axle parts are listed for the 2018 Audi TT, from GKN, APWI, GSP and 1 other brand. APWI AD8383 carries the "Popular" badge.
Listed part numbers: APWI AD8383, GKN 305771 and GKN 306629, plus the other parts above.
CV Joint
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GKN Fits: 2.5L L5 Turbocharged | 305448 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Pre-lubricatedThermosplastic Elastomer (TPE) | View on Amazon |
| MARELLI Fits: 2.5L L5 Turbocharged | TOJ0312 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Front | View on Amazon |
| VAICO Fits: 2.5L L5 Turbocharged | V106922 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Front Right Inner | View on Amazon |
This table covers the constant-velocity joints at each end of a drive axle.
3 CV Joint parts are listed for the 2018 Audi TT, from GKN, MARELLI and VAICO.
Listed part numbers: GKN 305448, MARELLI TOJ0312 and VAICO V106922.
CV Joint Boot
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GKN Fits: 2.5L L5 Turbocharged | 305967 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Length: 123 mmThermoplastic Elastomer | View on Amazon |
| GKN Fits: 2.5L L5 Turbocharged | 306237 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | OUTER Diameter 1.063 InThermoplastic Elastomer | 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.
GKN supplies both parts for the 2018 Audi TT.
This group includes GKN 305967 and GKN 306237.
Differential Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ELRING Fits: 1.8L L4 Turbocharged | 454260 | 🇲🇽 MX | Height [MM]: 8Inside Diameter: 50.0 mm | View on Amazon |
| ELRING Fits: 1.8L L4 Turbocharged | 454820 | 🇲🇽 MX | Inside Diameter: 60.0 mmOutside Diameter: 74.0 mm | View on Amazon |
| ELRING Fits: 1.8L L4 Turbocharged | 871060 | 🇲🇽 MX | Height [MM]: 12.6Radial Shaft Seal Design: SP | View on Amazon |
| ELRING Fits: 1.8L L4 Turbocharged | 228490 | 🇲🇽 MX | Height [MM]: 26.5Radial Shaft Seal Design: SP | View on Amazon |
This table covers the seals at the Differential. 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.
4 Differential Seal parts for the 2018 Audi TT come from ELRING.
This group includes ELRING 454260, ELRING 454820 and ELRING 871060 and the remaining parts above.
Drive Shaft Flex Joint
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VAICO Fits: 1.8L L4 Turbocharged | V1018008 | 🇲🇽 MX | View on Amazon |
This table covers the flex joints in the driveshaft.
One part is listed for the 2018 Audi TT — VAICO V1018008.
Gear Oil
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VALVOLINE Popular Fits: 2.5L L5 Turbocharged | VV975 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Advanced Full Synthetic SAE 75W-90 Gear Oil1 Quart | View on Amazon |
| VALVOLINE Popular Fits: 2.5L L5 Turbocharged | 889785 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Full Synthetic SAE 75W-90 Gear Oil1 Quart Flex Fill | View on Amazon |
| VAICO Fits: 2.5L L5 Turbocharged | V600364 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | 850MLTransmission code : JJN, JUY, KJU, KMC, KMD, MMK, MML | View on Amazon |
| VALVOLINE Fits: 2.5L L5 Turbocharged | 882505 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Advanced Full Synthetic SAE 75W-90 Gear Oil1 Gallon | View on Amazon |
| VALVOLINE Fits: 2.5L L5 Turbocharged | 723856 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Advanced Full Synthetic SAE 75W-90 Gear Oil5 Gallon | View on Amazon |
| VALVOLINE Fits: 2.5L L5 Turbocharged | 819195 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | VPS Full Synthetic SAE 75W-90 Gear Oil1 Quart | View on Amazon |
| VALVOLINE Fits: 2.5L L5 Turbocharged | 902146 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Extended Protection Full Synthetic SAE 75W-90 Gear Oil1 Quart Flex Fill | View on Amazon |
| VALVOLINE Fits: 2.5L L5 Turbocharged | 904644 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | VPS Full Synthetic SAE 75W-90 Gear Oil1 Quart Flex Fill | 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 are listed for the 2018 Audi TT, from VALVOLINE and VAICO. VALVOLINE VV975 carries the "Popular" badge.
Listed part numbers: VALVOLINE VV975, VALVOLINE 889785 and VAICO V600364, plus the other parts above.
Transfer Case Fluid
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VALVOLINE Popular Fits: 2.5L L5 Turbocharged | VV975 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Advanced Full Synthetic SAE 75W-90 Gear Oil1 Quart | View on Amazon |
| VALVOLINE Popular Fits: 2.5L L5 Turbocharged | 889785 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Full Synthetic SAE 75W-90 Gear Oil1 Quart Flex Fill | View on Amazon |
| VAICO Fits: 2.5L L5 Turbocharged | V10000270 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Description: Differential Fluid Change KitIncludes: Hydraulic Oil, Drain Plugs and Seal Rings | View on Amazon |
| VAICO Fits: 2.5L L5 Turbocharged | V10000270XXL | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Description: Differential Fluid Change KitIncludes: Hydraulic Oil, Hydraulic Filter, Drain Plugs, Seal Rings and Installation Hardware | View on Amazon |
| VALVOLINE Fits: 2.5L L5 Turbocharged | 882505 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Advanced Full Synthetic SAE 75W-90 Gear Oil1 Gallon | View on Amazon |
| VALVOLINE Fits: 2.5L L5 Turbocharged | 723856 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Advanced Full Synthetic SAE 75W-90 Gear Oil5 Gallon | View on Amazon |
| VALVOLINE Fits: 2.5L L5 Turbocharged | 819195 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | VPS Full Synthetic SAE 75W-90 Gear Oil1 Quart | View on Amazon |
| VALVOLINE Fits: 2.5L L5 Turbocharged | 902146 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Extended Protection Full Synthetic SAE 75W-90 Gear Oil1 Quart Flex Fill | View on Amazon |
| VALVOLINE Fits: 2.5L L5 Turbocharged | 904644 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | VPS Full Synthetic SAE 75W-90 Gear Oil1 Quart Flex Fill | View on Amazon |
This table covers the fluids specified for the transfer case. 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.
9 Transfer Case Fluid parts are listed for the 2018 Audi TT, from VALVOLINE and VAICO. VALVOLINE VV975 carries the "Popular" badge.
Listed part numbers: VALVOLINE VV975, VALVOLINE 889785 and VAICO V10000270, plus the other parts above.
Transfer Case Output Shaft Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| TIMKEN Fits: 2.5L L5 Turbocharged | SL260505 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Rear | View on Amazon |
This table covers the seals at the Transfer Case Output Shaft. 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 TT — TIMKEN SL260505.
Buying Drivetrain Parts for a 2018 Audi TT
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: Transfer Case Fluid and Gear Oil .
Frequently Asked Questions
How many drivetrain parts fit the 2018 Audi TT?
Our catalog currently lists 44 drivetrain parts for the 2018 Audi TT across 12 subcategories and 11 brands, covering all 3 engine options (1.8L L4 Turbocharged, 2.0L L4 Turbocharged and 2.5L L5 Turbocharged). Each part is matched to the engine(s) it fits.
Do drivetrain parts differ between 2018 Audi TT 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 2018 Audi TT?
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 TT 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 TT?
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 2018 Audi TT
Drivetrain Parts for Other Audi TT Years
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