This page lists 11 drivetrain parts for the 2026 BMW X3, across 8 part types, covering all 3 engine options (2.0L L4 ELECTRIC/GAS Turbocharged, 2.0L L4 Turbocharged and 3.0L L6 Turbocharged). Every part shows its brand, manufacturer part number and fitment notes.
The drivetrain system on the 2026 BMW X3 moves power from transmission to wheels through axles, CV joints, driveshafts, differentials and wheel-end hardware. The largest groups are Differential Fill / Drain Plug (2 parts), Differential Pinion Seal (2 parts) and Transfer Case Oil Drain Plug (2 parts). The other 5 part types cover the remaining 5 parts.
The 2026 BMW X3 was sold with 3 engines. 6 parts fit every engine; the other 5 are engine-specific. Each part shows which engine(s) it fits.
The most listed brands for 2026 BMW X3 drivetrain parts are REIN (6 parts), AJUSA (4 parts) and ELRING (1 part).
Each part number listed for the 2026 BMW X3 opens a page with every vehicle that part fits.
Axle Bolt
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| REIN Fits: all 2026 X3 engines | HWB1067 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Rearwith Spring, 16x1.5x72mm | View on Amazon |
This table covers the Axle bolts.
This group shows a single part: REIN HWB1067.
Axle Shaft Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| AJUSA Fits: 2.0L L4 ELECTRIC/GAS Turbocharged, 2.0L L4 Turbocharged | 12021750 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Rear | View on Amazon |
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.
This group shows a single part: AJUSA 12021750.
Differential Cover Gasket
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| AJUSA Fits: all 2026 X3 engines | 16031150 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | FrontCover O-Ring | View on Amazon |
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.
This group shows a single part: AJUSA 16031150.
Differential Fill / Drain Plug
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| REIN Fits: all 2026 X3 engines | HWP0065 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Fits Rear DifferentialM22X1.5, Steel | View on Amazon |
| REIN Fits: all 2026 X3 engines | HWU0065 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Fits Rear DifferentialM22X1.5, Aluminum | View on Amazon |
This table covers the Differential Fill drain plugs.
2 Differential Fill / Drain Plug parts for the 2026 BMW X3 come from REIN. Every part fits all 3 engine options (2.0L L4 ELECTRIC/GAS Turbocharged, 2.0L L4 Turbocharged and 3.0L L6 Turbocharged).
Listed part numbers: REIN HWP0065 and REIN HWU0065.
Differential Pinion Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| AJUSA Fits: 2.0L L4 ELECTRIC/GAS Turbocharged, 2.0L L4 Turbocharged | 12005350 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Rear45x75x10mm | View on Amazon |
| AJUSA Fits: all 2026 X3 engines | 12015650 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Front44x69x10/15mm | View on Amazon |
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.
2 Differential Pinion Seal parts for the 2026 BMW X3 come from AJUSA. 1 part fits every engine; the other 1 is engine-specific.
Part numbers include AJUSA 12005350 and AJUSA 12015650.
Differential Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ELRING Fits: 2.0L L4 Turbocharged | B16790 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Material: AEM (Ethylene Acrylate Rubber)Swirl Type: Alternating Twist | 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.
One part is listed for the 2026 BMW X3 — ELRING B16790.
Transfer Case Fluid
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| REIN Fits: all 2026 X3 engines | FLDF005 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | TF08701 Liter | 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.
This group shows a single part: REIN FLDF005.
Transfer Case Oil Drain Plug
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| REIN Fits: 2.0L L4 ELECTRIC/GAS Turbocharged, 3.0L L6 Turbocharged | HWP0065 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | M22x1.5, Steel | View on Amazon |
| REIN Fits: 2.0L L4 ELECTRIC/GAS Turbocharged, 3.0L L6 Turbocharged | HWU0065 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | M22x1.5, Aluminum | View on Amazon |
This table covers the Transfer Case Oil drain plugs.
2 Transfer Case Oil Drain Plug parts for the 2026 BMW X3 come from REIN.
Listed part numbers: REIN HWP0065 and REIN HWU0065.
Buying Drivetrain Parts for a 2026 BMW X3
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. Some drivetrain parts fit every engine; others are 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: Differential Fill / Drain Plug and Differential Pinion Seal .
Frequently Asked Questions
How many drivetrain parts fit the 2026 BMW X3?
Our catalog currently lists 11 drivetrain parts for the 2026 BMW X3 across 8 subcategories and 3 brands, covering all 3 engine options (2.0L L4 ELECTRIC/GAS Turbocharged, 2.0L L4 Turbocharged and 3.0L L6 Turbocharged). Each part is matched to the engine(s) it fits.
Do drivetrain parts differ between 2026 BMW X3 engines?
Some do. 6 parts fit every engine; the other 5 are engine-specific. Each row (and the filter at the top) shows which. 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 2026 BMW X3?
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 2026 BMW X3 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 2026 BMW X3?
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 2026 BMW X3
Drivetrain Parts for Other BMW X3 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.