The 2021 BMW I3S has 5 automatic transmission parts with verified fitment on this page — 2 part types and 2 brands, covering both the 647cc L2 ELECTRIC and the 647cc L2 ELECTRIC/GAS. Each part includes a manufacturer part number and application notes.
On the 2021 BMW I3S, the automatic transmission covers the automatic gearbox and its supporting cast — filters, coolers, solenoids, mounts and torque-converter parts. All 5 listed parts are Transmission Fluid Additive (4 parts) and Filter (1 part).
The 2021 BMW I3S was sold with both the 647cc L2 ELECTRIC and the 647cc L2 ELECTRIC/GAS. All 5 parts on this page fit every engine.
2 brands supply automatic transmission parts for the 2021 BMW I3S, led by LUBEGARD (4 parts) and ATP (1 part).
Each part number listed for the 2021 BMW I3S opens a page with every vehicle that part fits.
Filter
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ATP Fits: all 2021 I3S engines | B205 | 🇺🇸 US 🇨🇦 CA | Premium Replacement | View on Amazon |
This table covers the replacement filters for this application — the table heading and notes say which circuit. 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 2021 BMW I3S — ATP B205.
Transmission Fluid Additive
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| LUBEGARD Fits: all 2021 I3S engines | 60902 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Automatic Transmission Fluid Protectant10 oz | View on Amazon |
| LUBEGARD Fits: all 2021 I3S engines | 50902 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Automatic Transmission Fluid Protectant32 oz | View on Amazon |
| LUBEGARD Fits: all 2021 I3S engines | 50904 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Automatic Transmission Fluid Protectant5 Gallon | View on Amazon |
| LUBEGARD Fits: all 2021 I3S engines | 50905 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Automatic Transmission Fluid Protectant55 Gallon | View on Amazon |
This table covers the conditioners and additives used with this transmission fluid.
LUBEGARD supplies the 4 Transmission Fluid Additive parts for the 2021 BMW I3S. All of them fit every engine offered in the 2021 I3S.
Part numbers include LUBEGARD 60902, LUBEGARD 50902 and LUBEGARD 50904, among others listed above.
Buying Automatic Transmission Parts for a 2021 BMW I3S
On this vehicle, the automatic transmission covers the automatic gearbox and its supporting cast — filters, coolers, solenoids, mounts and torque-converter parts.
- You do not need to pick an engine: every automatic transmission part on this page fits both the 647cc L2 ELECTRIC and the 647cc L2 ELECTRIC/GAS.
- Read the notes on each row for position, trim and spec qualifiers before you order.
- Where labor overlaps, replace the filter and pan gasket with every fluid service, and flush the cooler lines when replacing a failed unit.
- Cross-reference the manufacturer part number against your old part or a service-manual listing.
Start with the largest groups on this page: Transmission Fluid Additive and Filter .
Frequently Asked Questions
How many automatic transmission parts fit the 2021 BMW I3S?
Our catalog currently lists 5 automatic transmission parts for the 2021 BMW I3S across 2 subcategories and 2 brands, covering both the 647cc L2 ELECTRIC and the 647cc L2 ELECTRIC/GAS. Each part is matched to the engine(s) it fits.
Do automatic transmission parts differ between 2021 BMW I3S engines?
No. On this page every automatic transmission part fits both the 647cc L2 ELECTRIC and the 647cc L2 ELECTRIC/GAS. You do not need to pick an engine to choose the right row — use the notes for position and trim.
What are the signs of automatic transmission problems on a 2021 BMW I3S?
Common symptoms include delayed or harsh engagement, slipping under load, fluid that smells burnt, or shuddering at light throttle around 40 mph. 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 filter and pan gasket with every fluid service, and flush the cooler lines when replacing a failed unit.
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?
Every part on this page already fits both the 647cc L2 ELECTRIC and the 647cc L2 ELECTRIC/GAS. Then use exactly the fluid specification in the notes — automatic transmissions are the least forgiving component on the vehicle about fluid choice. The notes column carries position and trim qualifiers where they apply.
Other Parts for the 2021 BMW I3S
Automatic Transmission 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.