Factory specifications, fluid capacities, torque values, EPA fuel economy and the federal safety record for the 2021 M340i xDrive.
The 2021 BMW M340i xDrive is a sedan that relies on 0W‑20 engine oil with a 6.8‑qt capacity and is mated to an 8‑speed automatic transmission, delivering EPA‑rated fuel economy of 22 mpg city, 31 mpg highway and 25 mpg combined. With only eleven total owner complaints logged for the year, the engine stands out as the most frequent trouble spot, and the model has been subject to six recalls. This places the 2021 model year at a relatively low‑complaint point in the M340i’s reliability history, suggesting a generally dependable iteration of the nameplate.
Fluid capacities, tune-up values and fuel economy at a glance.
Replacement part sizes and factory part numbers — battery, bulbs, filters and belts.
From the factory this vehicle uses OE oil filter 11428583896. Each part links to every other vehicle that shares it, so a part you already stock may fit more of your fleet than you'd expect.
| Engine oil filter | 11428583896 alt 11428583897 |
| Engine air filter | 13718635102 |
| Spark plug | 12122455258 |
| Battery | 61217604808 alt 61217555719 |
| Front wiper blades | 61619478361 |
| Thermostat | 11539494424 alt 11539494425 |
| Cabin air filter | 64119382886 alt 64119382885 |
Engine, drivetrain, dimensions and economy.
| Transmission | Automatic (S8) |
| Overall length | 185.4 in |
| Overall width | 72 in |
| Overall height | 56.7 in |
| Wheelbase | 112.2 in |
| Curb weight | 3825 lb |
| Track (front / rear) | 62.2 / 63 in |
| Weight distribution (front / rear) | 52/48 |
| EPA city / highway / combined | 22 / 31 / 25 mpg |
| Drivetrain | All-Wheel Drive |
| Passenger volume | 94 cu ft |
| Cargo volume | 13 cu ft |
| Recommended fuel | Premium Gasoline |
Capacities, torques and tune-up values from the factory service manual.
This engine holds 6.8 qt of 0W-20 engine oil, DOT 4 brake fluid. Torque lug nuts to 103 ft-lbs. The firing order is 1-5-3-6-2-4.
| Automatic Transmission Fluid | ATF3 |
| Automatic Transmission Fluid Capacity | 9.8 qt |
| Brake Fluid | DOT 4 |
| Clutch Fluid | DOT 4 |
| Engine Oil | 0W-20 |
| Engine Oil Capacity | 6.8 qt |
| Power Steering Fluid | ATF |
| Cylinder Head Instructions | Only use new bolts. |
| Oil Pump to Cylinder BLock Bolts/Studs | 168.0 inch lbs. ft-lbs |
| Differential Fill Plug | Final Drive: Use new plug: 44.0 ft-lbs |
| Lug Nuts | 103 ft-lbs |
| Cylinder Firing Order | 1-5-3-6-2-4 |
| Refrigerant | R1234yf |
| Oil Group | PAG |
| Oil Type | 46YF |
| Brake Caliper Bolt to Carrier Torque | 26.0 |
| Brake Caliper Carrier to Hub Bolt Torque | Use new bolts. 81.0 ft-lbs |
| ABS Sensor Torque | 6.6 |
| Vented Rotor Minimum Thickness for Replacement | Front: 12.99; Rear: 12.99 |
| 1 | Bolts 1-14 | 22 ft. lbs |
Owner-reported issues, recalls, investigations and service bulletins on record with NHTSA — an unfiltered look at what owners actually experience.
Owner complaints about the 2021 BMW M340i xDrive dominate in one area — the engine, 6 of 11 reports (55%), well ahead of the next concern. None of this vehicle's 6 recall campaigns target the engine, so those reports read as owner-reported wear-and-tear rather than an acknowledged defect. 0 of the reports describe a crash and 0 a fire — a small share of the total, but worth weighing against the engine pattern above. These are tallies of what owners actually reported to the federal government, not an editorial score — and higher-selling models naturally rack up more reports.
All 11 complaints on record, top 6 components.
Source: NHTSA Office of Defects Investigation complaint database.
Showing 2 of 6 campaigns on record for this vehicle.
BMW of North America, LLC (BMW) is recalling certain 2021 2 Series (230i, 230i xDrive, M240i, M240i xDrive), 330e, 330e Xdrive, 4 Series Coupe (430i, 430i xDrive, M440i xDrive) M4 Coupe, M4 Competition Coupe, BMW 4… Remedy: Dealers will inspect the seat belt retractors (including the seat belts) and, if necessary, replace the retractors, free of charge. Owner notification letters were mailed on…
BMW of North America, LLC (BMW) is recalling certain 2021 M340i xDrive, M440i xDrive Coupe, 530i, 530i xDrive, 540i, 540i xDrive, 740Li, 740Li xDrive, 840i Gran Coupe, 840i xDrive Gran Coupe, X5 sDrive40i, X5 xDrive40i… Remedy: BMW will notify owners, and dealers will inspect the connection between the 48-Volt battery and the starter-generator assembly, replacing it if necessary, free of charge. The…
Showing 5 of 183 bulletins on record with NHTSA.
| Bulletin | Date | Component | Summary |
|---|---|---|---|
| B010325 | 2025-04-15 | Structure | The Radiator Grilles Lower Active Air Flap Assembly limited warranty for defects in… |
| B720225 | 2025-04-09 | Electrical System | The Supplemental Restraint Systems (SRS) Front Passenger’s Seat Occupancy Capacitive… |
| B611305 | 2024-01-11 | Electrical System | The electrical system of BMW vehicles has been subject to an ongoing development process… |
| B340714 | 2023-10-13 | Service Brakes, Hydraulic | Functional noises (squealing/honking) when braking shortly before the vehicle comes to a… |
| B240323 | 2023-08-01 | Engine And Engine Cooling | ?A software error may cause an unwanted pressure pulsation in the transmission during a… |
The most common OBD-II codes for this vehicle's emissions system. These are standardized SAE J2012 definitions, not vehicle-specific fault reports.
Decode factory build data for a specific vehicle by VIN.
Find every vehicle that shares this one's battery, bulbs, oil capacity, platform or parts.
Cross-vehicle references for the kinds of data on this page.
6.8 qt of BMW LongLife LL-14FE+ or LL-17FE+ 0W-20, per the factory manual.
NHTSA lists 6 recall campaign(s) for this model year. Check your specific vehicle by VIN.
EPA figures are 22 city / 31 highway / 25 combined mpg.