Checked oil specs by engine
2021 BMW M340i oil capacity, type & filter
The 2021 BMW M340i takes 7.6 qt of 0W-20 oil. Supported by 5 checked sources.
Applies to checked engine: 3.0L 6-Cyl Turbo. Also check 2021 BMW M340i xDrive .
Catalog selectors list the 2021 BMW M340i as its own oil row, separate from nearby BMW model rows. In the checked rows, the checked capacity, viscosity, and filter pattern is not identical to 2021 BMW M340i xDrive. Confirm the exact model name before buying oil or a filter; similar model names can share or split catalog rows. Current-row label: model qualifier absent. Nearby catalog rows add xDrive; use the seller row without that qualifier.
PRO-TEC PXL10342 is copied into the checkout checklist as the first source-backed candidate for the 3.0L 6-Cyl Turbo. 6 other candidate numbers are kept for cross-checking; confirm the exact filter in the retailer selector before buying.
Oil specs changed in the 2020 checked record compared with this 2021 page — confirm you are on the correct model year before ordering.
Same oil specs also checked for the 2021 BMW M440i.
Capacity shown is the With filter. Confirm before adding oil.
Search paths only — confirm the bottle matches your viscosity, API/OEM approval requirements, and purchase quantity before checkout.
2021 BMW M340i oil specs: capacity conditions and filter notes
The filter part numbers listed above come from checked source rows for this vehicle and engine. Use them as candidates, then confirm the exact part number at checkout; do not substitute across engine rows.
With filter means the volume includes a new filter. Service fill is the typical drain-and-fill amount. Dry fill is for a fresh empty engine only.
Retailer fitment tools may use different data. Confirm oil capacity, viscosity, and filter part number before ordering.
Quick reference for this 2021 BMW M340i
- Capacity
- 7.6 qt (With filter)
- Oil type
- 0W-20
- Interval
- Check owner's manual / oil-life monitor
- Filter
- PRO-TEC PXL10342
Source check: Last checked 2026-06-23 from K&N Filters, Pennzoil oil application database, RockAuto parts catalog, AMSOIL fitment lookup, and Purolator fitment catalog.
Checked oil rows for the 2021 BMW M340i share the listed capacity, viscosity, and filter pattern with 2021 BMW M440i. This page remains keyed to the exact M340i row; confirm that model in the seller selector before buying oil or a filter.
BMW M340i oil specs by year
The 2021 page is the fourth-newest M340i oil record. Oil specs changed in the 2020 model year — confirm you are on the correct year before buying oil or a filter.
| Year | Capacity | Oil type | Filter |
|---|---|---|---|
| 2024 | 6.9 qt | 0W-20 | WIX 51032 |
| 2023 | 6.9 qt | 0W-20 | WIX 51032 |
| 2022 | 7.6 qt | 0W-20 | WIX 51032 |
| 2021 Current page | 7.6 qt | 0W-20 | PRO-TEC PXL10342 |
| 2020 | 6.9 qt | 0W-20 | WIX 51032 |
How we verified 2021 BMW M340i oil data
How we verify fitmentChecked fitment data. Last checked: 2026-06-23.
This page checked 5 sources for the 2021 BMW M340i. Capacity: Pennzoil oil application database; oil type: Pennzoil oil application database and AMSOIL fitment lookup; filter: Purolator fitment catalog, AMSOIL fitment lookup, RockAuto parts catalog, and K&N Filters.
- Confidence
- Cross-check pending
- Sources checked
- 5
- Last checked
- 2026-06-23
- Capacity: Pennzoil oil application database
- Oil type: Pennzoil oil application database and AMSOIL fitment lookup
- OEM oil spec: Not source-backed on this page
- Filter: Purolator fitment catalog, AMSOIL fitment lookup, RockAuto parts catalog, and K&N Filters
- Change interval: Not source-backed on this page
| Source | Supports | Checked | Link |
|---|---|---|---|
| K&N Filters | Filter | 2026-06-23 | Visit brand site |
| Pennzoil oil application database | Capacity, Oil type | 2026-06-23 | Visit brand site |
| RockAuto parts catalog | Filter | 2026-06-23 | Checked source |
| AMSOIL fitment lookup | Oil type, Filter | 2026-06-23 | Visit brand site |
| Purolator fitment catalog | Filter | 2026-06-23 | Visit brand site |
2021 BMW M340i oil questions that affect checkout
Does the listed capacity include the filter?
Check the capacity condition shown above. With filter includes a new filter; service fill is the normal drain-and-fill amount; dry fill is for a fresh empty engine.
2021 BMW M340i oil — questions before buying
- Can I use 5W-20 or 5W-30 instead of 0W-20 in my 2021 BMW M340i?
- The checked source rows on this page list 0W-20 for the 2021 BMW M340i. Use 0W-20 unless your owner's manual, oil cap, or service information for your exact engine allows another grade. If a retailer suggests 5W-20 or 5W-30, match the engine row first and confirm the grade before buying.
2021 BMW M340i maintenance checklist
One part checked. Look up the rest while you're here.
- Cabin air filter 2021 BMW M340i cabin filter part numbers
- Engine air filter 2021 BMW M340i engine filter part numbers
- Wiper blade size 2021 BMW M340i driver & passenger blade sizes
- Oil type & capacity 0W-20 · 7.6 qt Checked
Where to buy
These are retailer search paths for listed specs on this page. Use the retailer's vehicle selector at checkout to confirm before ordering.
This section may include affiliate or sponsored retailer links. They are search paths, not fitment evidence.
Walmart
Search Walmart for 2021 BMW M340i oil and filter, then match the listing specs against the capacity and viscosity shown above before adding to cart.
Search 2021 BMW M340i oil & filter →AutoZone
Use AutoZone's vehicle selector for the 2021 BMW M340i to confirm oil capacity, viscosity, and filter fitment before checkout.
Search 2021 BMW M340i oil & filter →Amazon
Search Amazon for the 2021 BMW M340i oil and filter and verify the listing's engine fit note matches your engine before ordering.
Search 2021 BMW M340i oil & filter →O'Reilly
Open O'Reilly's fitment search for the 2021 BMW M340i oil and filter and cross-check capacity, viscosity, and filter part number against the specs above.
Search 2021 BMW M340i oil & filter →Look up another vehicle
Find checked oil capacity, type, and filter data by exact year, make, and model.