This page lists 25 engine parts for the 2021 BMW I3S, across 12 part types, covering both the 647cc L2 ELECTRIC and the 647cc L2 ELECTRIC/GAS. Every part shows its brand, manufacturer part number and fitment notes.
The engine on the 2021 BMW I3S 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 Oil (6 parts), Oil Filter (6 parts) and Crankshaft Seal (2 parts). The other 9 part types cover the remaining 11 parts.
The 2021 BMW I3S was sold with both the 647cc L2 ELECTRIC and the 647cc L2 ELECTRIC/GAS. Every part on this page is engine-specific. Each part shows which engine(s) it fits.
12 brands supply engine parts for the 2021 BMW I3S, led by AJUSA (11 parts), LIQUI MOLY (3 parts) and VALVOLINE (2 parts), plus 9 more brands. Quality grades include Standard Replacement and Economy.
A "Popular" badge means the source catalog flagged the part as frequently chosen for the 2021 BMW I3S. 4 parts have it, including MOBIL 127568 (Oil) and FRAM PH8170 (Oil Filter). Each part number opens a page with every vehicle that part fits.
Conversion / Lower Gasket Set
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| AJUSA Fits: 647cc L2 ELECTRIC/GAS | 54301500 | 🇺🇸 US 🇨🇦 CA | 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.
One part is listed for the 2021 BMW I3S — AJUSA 54301500.
Crankshaft Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| AJUSA Fits: 647cc L2 ELECTRIC/GAS | 15108400 | 🇺🇸 US 🇨🇦 CA | FrontClockwise | View on Amazon |
| AJUSA Fits: 647cc L2 ELECTRIC/GAS | 15108500 | 🇺🇸 US 🇨🇦 CA | RearCounter Clockwise | 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.
2 Crankshaft Seal parts for the 2021 BMW I3S come from AJUSA.
Part numbers include AJUSA 15108400 and AJUSA 15108500.
Cylinder Head Gasket
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| AJUSA Fits: 647cc L2 ELECTRIC/GAS | 10221100 | 🇺🇸 US 🇨🇦 CA | Multi Layered Steel | 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.
One part is listed for the 2021 BMW I3S — AJUSA 10221100.
Cylinder Head Gasket Set
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| AJUSA Fits: 647cc L2 ELECTRIC/GAS | 52560000 | 🇺🇸 US 🇨🇦 CA | 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.
One part is listed for the 2021 BMW I3S — AJUSA 52560000.
Engine Kit Gasket Set
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| AJUSA Fits: 647cc L2 ELECTRIC/GAS | 50513300 | 🇺🇸 US 🇨🇦 CA | 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.
One part is listed for the 2021 BMW I3S — AJUSA 50513300.
Intake Manifold Gasket
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| AJUSA Fits: 647cc L2 ELECTRIC/GAS | 13270300 | 🇺🇸 US 🇨🇦 CA | Lower | View on Amazon |
| AJUSA Fits: 647cc L2 ELECTRIC/GAS | 24048200 | 🇺🇸 US 🇨🇦 CA | Upper | 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.
AJUSA supplies both parts for the 2021 BMW I3S.
This group includes AJUSA 13270300 and AJUSA 24048200.
Oil
Summary: Notes list SAE 0W-30 and SAE 5W-30. Confirm the engine and the weight on the filler cap before you buy. Replacement brands in this table include LIQUI MOLY, VALVOLINE and MOBIL.
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| MOBIL Popular Fits: 647cc L2 ELECTRIC/GAS | 127568 | 🇺🇸 US | ESP 5W30 1 Quart | View on Amazon |
| VALVOLINE Popular Fits: 647cc L2 ELECTRIC/GAS | 787301 | 🇺🇸 US 🇨🇦 CA | European Vehicle Full Synthetic SAE 5W-301 Quart | View on Amazon |
| LIQUI MOLY Fits: 647cc L2 ELECTRIC/GAS | 22260 | 🇺🇸 US 🇨🇦 CA | Special Tec B FE 0W-301 Liter | View on Amazon |
| LIQUI MOLY Fits: 647cc L2 ELECTRIC/GAS | 22261 | 🇺🇸 US 🇨🇦 CA | Special Tec B FE 0W-305 Liter | View on Amazon |
| LIQUI MOLY Fits: 647cc L2 ELECTRIC/GAS | 22269 | 🇺🇸 US 🇨🇦 CA | Special Tec B FE 0W-3020 Liter | View on Amazon |
| VALVOLINE Fits: 647cc L2 ELECTRIC/GAS | 893931 | 🇺🇸 US 🇨🇦 CA | European Vehicle Full Synthetic SAE 0W-301 Quart | 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.
6 Oil parts for the 2021 BMW I3S come from 3 brands — LIQUI MOLY, VALVOLINE and MOBIL. The "Popular" part is MOBIL 127568.
Part numbers include MOBIL 127568, VALVOLINE 787301 and LIQUI MOLY 22260, among others listed above.
Oil Filter
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| CHAMP / LUBER-FINER Fits: 647cc L2 ELECTRIC/GAS | PH3656 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FRAM Popular Fits: 647cc L2 ELECTRIC/GAS | PH8170 | 🇺🇸 US 🇨🇦 CA | Extra GuardIncludes Gasket | View on Amazon |
| MAHLE / CLEVITE Popular Fits: 647cc L2 ELECTRIC/GAS | OC306 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| BECK/ARNLEY Fits: 647cc L2 ELECTRIC/GAS | 0410879 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| MANN Fits: 647cc L2 ELECTRIC/GAS | MW75 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| WIX Fits: 647cc L2 ELECTRIC/GAS | WL10245 | 🇺🇸 US 🇨🇦 CA | 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.
6 Oil Filter parts for the 2021 BMW I3S come from 6 brands — CHAMP / LUBER-FINER, FRAM, MAHLE / CLEVITE and 3 other brands. The "Popular" part is FRAM PH8170.
The Economy section lists 1 option from CHAMP / LUBER-FINER — the catalog's value-priced group. CHAMP / LUBER-FINER PH3656 is listed in this group.
In the Standard Replacement grade, FRAM, MAHLE / CLEVITE, BECK/ARNLEY and 2 other brands supply 5 parts: built to original-equipment specification. A representative part number is FRAM PH8170.
Listed part numbers: FRAM PH8170, CHAMP / LUBER-FINER PH3656 and MAHLE / CLEVITE OC306, plus the other parts above.
Oil Pan Gasket
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VICTOR REINZ Fits: 647cc L2 ELECTRIC/GAS | 703141410 | 🇺🇸 US 🇨🇦 CA | RTV Silicone | View on Amazon |
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.
This group shows a single part: VICTOR REINZ 703141410.
Timing Chain Tensioner Gasket / Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ELRING Fits: 647cc L2 ELECTRIC/GAS | 697210 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
This table covers the seals at the Timing Chain Tensioner Gasket. 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 2021 BMW I3S — ELRING 697210.
Valve Cover Gasket
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| AJUSA Fits: 647cc L2 ELECTRIC/GAS | 56061300 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
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.
This group shows a single part: AJUSA 56061300.
Valve Stem Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| AJUSA Fits: 647cc L2 ELECTRIC/GAS | 12035900 | 🇺🇸 US 🇨🇦 CA | 4.2 x 7.2 x 8.5 | View on Amazon |
| AJUSA Fits: 647cc L2 ELECTRIC/GAS | 57073500 | 🇺🇸 US 🇨🇦 CA | 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.
2 Valve Stem Seal parts for the 2021 BMW I3S come from AJUSA.
Listed part numbers: AJUSA 12035900 and AJUSA 57073500.
Buying Engine Parts for a 2021 BMW I3S
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: Oil and Oil Filter .
Frequently Asked Questions
How many engine parts fit the 2021 BMW I3S?
Our catalog currently lists 25 engine parts for the 2021 BMW I3S across 12 subcategories and 12 brands, covering both the 647cc L2 ELECTRIC and the 647cc L2 ELECTRIC/GAS. Each part is matched to the engine(s) it fits.
Do engine parts differ between 2021 BMW I3S 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 2021 BMW I3S?
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 2021 BMW I3S?
Oil rows on this page include SAE 0W-30 and SAE 5W-30. 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 2021 BMW I3S 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 2021 BMW I3S?
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 2021 BMW I3S
Engine Parts for Other BMW I3S Years
Switch vehicle or jump to a subcategory
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.