2021 Audi S4 Engine Parts

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. Read more

2 Conversion / Lower Gasket Set parts for the 2021 Audi S4 come from 2 brands — AJUSA and VICTOR REINZ.

Part numbers include AJUSA 54261900 and VICTOR REINZ 081016401.

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. Read more

5 Crankshaft Seal parts are listed for the 2021 Audi S4, from VICTOR REINZ, AJUSA and MAHLE / CLEVITE. VICTOR REINZ 813555300 carries the "Popular" badge.

Part numbers include VICTOR REINZ 813555300, AJUSA 15088800 and AJUSA 15084000, among others listed above.

This table covers the bolts that clamp the cylinder head to the block. Read more

2 Cylinder Head Bolt parts for the 2021 Audi S4 come from 2 brands — AJUSA and MAHLE / CLEVITE.

Listed part numbers: AJUSA 81054000 and MAHLE / CLEVITE GS34094.

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. Read more

5 Cylinder Head Gasket parts for the 2021 Audi S4 come from 2 brands — AJUSA and MAHLE / CLEVITE.

Part numbers include AJUSA 10229700, AJUSA 10229800 and AJUSA 52500800, among others listed above.

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. Read more

3 Cylinder Head Gasket Set parts for the 2021 Audi S4 come from 2 brands — VICTOR REINZ and AJUSA.

This group includes AJUSA 52500700, VICTOR REINZ 021005002 and VICTOR REINZ 021005102.

This table covers the Cylinder Head temperature sensors. Typical signs include hard cold starts, a fan that never comes on, or a gauge that disagrees with the scan tool. A sensor that reads open or shorted is usually the part; an implausible-but-smooth reading can be wiring. Read more

One part is listed for the 2021 Audi S4 — STANDARD MOTOR PRODUCTS TS686.

This table covers the Engine covers. Read more

This group shows a single part: TECHPRO AU1228145.

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. Read more

This group shows a single part: AJUSA 50450700.

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. Read more

2 Intake Manifold Gasket parts for the 2021 Audi S4 come from 2 brands — AJUSA and VICTOR REINZ.

This group includes AJUSA 13282800 and VICTOR REINZ 711760700.

This table covers the mounts that hold the engine to the chassis. 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. Read more

9 Motor Mount parts are listed for the 2021 Audi S4, from SKP, ANCHOR, PIONEER and 2 other brands. SKP SK10216 carries the "Popular" badge. 7 parts fit every engine; the other 2 are engine-specific.

In the Economy grade, SKP supplies 2 parts: the catalog's value-priced group. A representative part number is SKP SK10216.

The Standard Replacement section lists 7 options from ANCHOR, PIONEER, WESTAR and 1 other brand — built to original-equipment specification. ANCHOR 10215 is listed in this group.

This group includes SKP SK10216, SKP SK10215 and ANCHOR 10215 and the remaining parts above.

This table covers the Motor Mount kits. Read more

One part is listed for the 2021 Audi S4 — ANCHOR 300966.

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. Read more

16 Oil parts are listed for the 2021 Audi S4, from PENTOSIN, LIQUI MOLY, VAICO and 2 other brands. LIQUI MOLY 20238 carries the "Popular" badge. All of them fit every engine offered in the 2021 S4.

This table covers the heat exchangers that cool engine oil. Typical signs include oil at the cooler fittings, or coolant that looks like a milkshake. Pressure-test both circuits after a cooler swap — a leak here mixes oil and coolant. Read more

3 Oil Cooler parts are listed for the 2021 Audi S4, from DORMAN, NISSENS and VEMO. 1 part fits every engine; the other 2 are engine-specific.

Listed part numbers: DORMAN 918948, NISSENS 91445 and VEMO V15606083.

This table covers the seals at the Oil Dipstick / Tube. 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. Read more

This group shows a single part: FEL-PRO 73668.

This table covers the drain plugs in the oil pan. Read more

REIN supplies both parts for the 2021 Audi S4. All of them fit every engine offered in the 2021 S4.

This group includes REIN HWP1014 and REIN HWU1014.

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. Read more

5 Oil Drain Plug Gasket parts for the 2021 Audi S4 come from 4 brands — DORMAN, AJUSA, FEL-PRO and 1 other brand. The "Popular" part is DORMAN 095147. 4 parts fit every engine; the other 1 is engine-specific.

This group includes DORMAN 095147, AJUSA 22018700 and DORMAN 995147CD and the remaining parts above.

This table covers the caps on the oil filler neck. Read more

One part is listed for the 2021 Audi S4 — MOTORAD MO153.

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. Read more

10 Oil Filter parts are listed for the 2021 Audi S4, from CHAMP / LUBER-FINER, ULTRA-POWER, VAICO and 7 other brands. HENGST E914HD398 carries the "Popular" badge. 8 parts fit every engine; the other 2 are engine-specific.

Economy: 3 parts, from CHAMP / LUBER-FINER, ULTRA-POWER and VAICO. A representative part number is CHAMP / LUBER-FINER P1074.

The Standard Replacement section: 7 options from HENGST, WIX, ACDELCO and 4 other brands. HENGST E914HD398 is listed in this group.

This table covers the Oil Filter covers. Read more

This group shows a single part: MOTORAD MO374.

This table covers the Oil Filter housings. Read more

3 Oil Filter Housing parts for the 2021 Audi S4 come from 3 brands — DORMAN, REIN and VAICO. Every part fits both the 3.0L V6 Supercharged and the 3.0L V6 Turbocharged.

This group includes DORMAN 926528, REIN HEU0119 and VAICO V107598.

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. Read more

One part is listed for the 2021 Audi S4 — AJUSA 01899000.

This table covers the gaskets between the oil pan and the block. 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. Read more

One part is listed for the 2021 Audi S4 — VICTOR REINZ 703141410.

This table covers the Oil Temperature senders. Read more

This group shows a single part: VEMO V10720240.

This table covers the guides and dampers that keep the timing chain on its path. Read more

This group shows a single part: ÜRO PARTS 079109470.

This table covers the turbochargers that compress intake air. Read more

2 Turbocharger parts are listed for the 2021 Audi S4, from BORG-WARNER and ROTOMASTER. 1 part fits every engine; the other 1 is engine-specific.

Part numbers include BORG-WARNER 18539880164 and ROTOMASTER K1030177N.

This table covers the Turbocharger Boost sensors. Typical signs include a warning lamp, a stored code, or a reading that drops out when the harness is wiggled. Inspect the connector and ground before replacing the sensor — wiring faults are often condemned as bad sensors. Read more

2 Turbocharger Boost Sensor parts for the 2021 Audi S4 come from WELLS.

Part numbers include WELLS 5S15121 and WELLS 5S15727.

This table covers the gaskets that seal the Turbocharger. 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. Read more

This group shows a single part: AJUSA JTC12476.

This table covers the Turbocharger Oil lines. Typical signs include a wet fitting, a rusted pipe, or a pressure loss in this circuit. Flare or thread the new line the way the notes specify; a kinked replacement will fail early. Read more

One part is listed for the 2021 Audi S4 — AJUSA OP11063.

This table covers the Valve covers. Read more

2 Valve Cover parts for the 2021 Audi S4 come from VAICO. Every part fits both the 3.0L V6 Supercharged and the 3.0L V6 Turbocharged.

Part numbers include VAICO V109193 and VAICO V109194.

This table covers the gaskets that seal the valve cover 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. Read more

4 Valve Cover Gasket parts are listed for the 2021 Audi S4, from AJUSA and VICTOR REINZ.

Part numbers include AJUSA 11148000, AJUSA 11148100 and VICTOR REINZ 711761000, among others listed above.

This table covers the lifters / tappets that transfer cam motion to the valves. Read more

One part is listed for the 2021 Audi S4 — AJUSA 85009000.

This table covers the keepers that lock each valve-spring retainer to the stem. Read more

3 Valve Spring Retainer Keeper parts for the 2021 Audi S4 come from 3 brands — MELLING, QUALCAST and SBI. 1 part fits every engine; the other 2 are engine-specific.

Listed part numbers: MELLING VL1098, QUALCAST 345021 and SBI 1211098.

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. Read more

4 Valve Stem Seal parts are listed for the 2021 Audi S4, from AJUSA, MAHLE / CLEVITE and VICTOR REINZ.

This group includes AJUSA 12037600, AJUSA 57077400 and MAHLE / CLEVITE SS45940A and the remaining parts above.

This table covers the oil-control solenoids that command the cam phasers. Typical signs include a door or range that will not move, or a click with no motion. Confirm the command signal before replacing the actuator — a failed module looks the same. Read more

One part is listed for the 2021 Audi S4 — STANDARD MOTOR PRODUCTS VVT473.