2021 BMW X4 Drivetrain Parts

This table covers the seals where an axle shaft exits the housing. 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 Axle Shaft Seal parts for the 2021 BMW X4 come from 2 brands — TIMKEN and AJUSA. 3 parts fit every engine; the other 1 is engine-specific.

Part numbers include AJUSA 12021750, TIMKEN SL260472 and TIMKEN SL260162, among others listed above.

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. Read more

7 CV Axle parts for the 2021 BMW X4 come from 4 brands — APWI, TOP NOTCH, TRAKMOTIVE and 1 other brand. The "Popular" part is APWI BM8357. 5 parts fit every engine; the other 2 are engine-specific.

Listed part numbers: APWI BM8357, TOP NOTCH TN10072 and APWI BM8358, plus the other parts above.

This table covers the gaskets that seal the Differential Cover. 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 16031150.

This table covers the Differential Fill drain plugs. Read more

2 Differential Fill / Drain Plug parts for the 2021 BMW X4 come from REIN. Every part fits both the 2.0L L4 Turbocharged and the 3.0L L6 Turbocharged.

Part numbers include REIN HWP0065 and REIN HWU0065.

This table covers the seals at the differential pinion yoke. 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 Differential Pinion Seal parts for the 2021 BMW X4 come from 2 brands — AJUSA and TIMKEN. 3 parts fit every engine; the other 1 is engine-specific.

Part numbers include AJUSA 12005350, AJUSA 12015650 and TIMKEN SL260487, among others listed above.

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. Read more

ELRING supplies the 4 Differential Seal parts for the 2021 BMW X4. All of them fit every engine offered in the 2021 X4.

Part numbers include ELRING 729370, ELRING 761160 and ELRING B16790, among others listed above.

This table covers the driveshafts that carry torque from the transmission or transfer case. Read more

6 Drive Shaft parts are listed for the 2021 BMW X4, from VAICO, CARDONE and DORMAN. 5 parts fit every engine; the other 1 is engine-specific.

This group includes CARDONE 657049, DORMAN 966449 and VAICO V204442 and the remaining parts above.

This table covers the Drive Shaft Center Support bearings. Typical signs include a growl that rises with speed, or play in the shaft or hub. Set preload the way the notes specify. A dry or crushed bearing fails quickly. Read more

One part is listed for the 2021 BMW X4 — REIN BEM0039P.

This table covers the flex joints in the driveshaft. Read more

2 Drive Shaft Flex Joint parts for the 2021 BMW X4 come from 2 brands — AAE and VAICO. 1 part fits every engine; the other 1 is engine-specific.

Listed part numbers: AAE FJC0118 and VAICO V204995.

This table covers the seals at the Drive 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. Read more

This group shows a single part: ELRING B15590.

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. Read more

2 Gear Oil parts for the 2021 BMW X4 come from VALVOLINE. Every part fits both the 2.0L L4 Turbocharged and the 3.0L L6 Turbocharged.

Part numbers include VALVOLINE 915052 and VALVOLINE 915053.

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. Read more

This group shows a single part: REIN FLDF005.

This table covers the Transfer Case Oil drain plugs. Read more

2 Transfer Case Oil Drain Plug parts for the 2021 BMW X4 come from REIN. Every part fits both the 2.0L L4 Turbocharged and the 3.0L L6 Turbocharged.

This group includes REIN HWP0065 and REIN HWU0065.