F40 · 2019–2024
Built from 2019 to 2024, the M135i xDrive uses the 225 kW B48 four-cylinder petrol engine. Identify it by the kW figure on the registration document; an oil change takes 5.25 l, and the car itself calculates its service dates.
Figures apply to the cited configuration and market; equipment and transmissions may vary by production date.
Specification source : [1] BMW Group [2] BMW Group [6] BMW Group
1,998 cc four-cylinder petrol turbo, B48 family (ADAC engine code B48A20E, “B48A20T1” in BMW UK’s technical data): 225 kW (306 PS) and 450 Nm. Gearbox: eight-speed Steptronic Sport automatic only. BMW quotes 4.8 s for 0–100 km/h and a top speed of 250 km/h. WLTP combined consumption on BMW’s 03/2021 sheet: 7.8–7.3 l/100 km. The range-topper from launch: BMW’s most powerful four-cylinder at the time, with xDrive, a mechanical limited-slip differential at the front axle and the Steptronic Sport gearbox. Cooling is upgraded with a separate transmission oil cooler, an 850 W electric fan and two remote radiators in the wheel arches.
Oil change: 5.25 l according to BMW’s 05/2019 specification sheet (“oil change”). The 11/2020 and 03/2021 sheets and BMW UK’s technical data give the same quantity. For top-ups, the handbook allows up to 1 litre of BMW Longlife-12 FE or Longlife-17 FE+, SAE 0W-20 or 0W-30 (ACEA C2 or C5 if unavailable), with no additives. The level is measured electronically: it is monitored while driving, and a detailed measurement can be started with the car stationary, level and warm, under CAR › Vehicle status › Engine oil level. Only add oil when the car asks for it, by the quantity it displays.
The car calculates each due date from how it is used (Condition Based Service) and briefly shows the next date or remaining distance when switched on; details are under CAR › Vehicle status › Service required. BMW’s regular maintenance covers engine oil, brake fluid, a vehicle check, the air filter, the cabin microfilter and the spark plugs. Brake fluid is counted in time and periods with the battery disconnected are not counted: have the workshop update the time-based items. Neither the handbook nor BMW’s list sets a mileage or period for these items: the dates are the ones your car displays.
The BMW documents consulted do not describe this engine’s timing drive. It appears neither in the handbook nor in BMW’s regular maintenance list: no replacement is scheduled. An unusual noise at start-up or idle still calls for a diagnosis.
Check the power on the registration document (225 kW) and the first-registration date. Note the items and dates shown under “Service required”. Give the service advisor the key the car was last driven with: the car stores its service data in it. Ask for 5.25 l of a BMW-approved oil, then check that the work is entered in the electronic service history, which a later owner can view.
Source : [9]
Due date calculated by CBS
Oil change at the date the car displays; do not run past it. Top-up: up to 1 litre of BMW Longlife-12 FE or Longlife-17 FE+ oil, SAE 0W-20 or 0W-30 (ACEA C2 or C5 if unavailable). No additives.
Source [9]As the service requirement dictates
BMW lists as regular maintenance: brake fluid, a vehicle check to BMW specifications, air filter, cabin microfilter and spark plugs. Each item is triggered by the service requirement the car calculates.
Source [10]Calendar-based (CBS)
Counted in time, not kilometres. Periods with the battery disconnected are not counted: have the workshop update the time-based items (brake fluid, and where applicable oil and microfilter). The handbook does not state the period.
Source [9]Regular check, engine cold
Level between the Min and Max marks in the filler neck, engine cold. BMW recommends coolant to BMW LC-18, mixed 50:50 with water; do not mix additives of different colours. Up to two expansion tanks depending on the engine.
Source [9]BMW revised the chassis: more front-wheel camber, redesigned mounts for the rear trailing and control arms, recalibrated springs and dampers, and a retuned engine sound in the cabin. Output stays at 225 kW.
Source : [7]
BMW’s handbook specifies Super Plus RON 98 for the M Performance model. The minimum is RON 91 according to the handbook and BMW’s 03/2021 sheet, but RON 95 on the 05/2019 sheet. For the published performance, BMW refers to the grade in its sales literature; BMW UK’s technical data recommends RON 98.
BMW quotes 4.7 s for 0–100 km/h with the M Performance package, available from 11/2019; the standard car is quoted at 4.8 s.
Source : [1]
Electronically: the level is monitored while driving and shown under CAR › Vehicle status › Engine oil level after about 30 minutes of normal driving. For a detailed measurement, park on level ground with the engine warm and the gearbox in neutral or P, then start the measurement in the same menu.
Source : [9]
BMW Group · EN · Europe (ACEA) · PDF p. 2 (launch dates), pp. 13–14 (xDrive, limited-slip differential), pp. 16–20 (engines, transmissions) · Accessed 08/10/2026
BMW Group · EN · Europe (ACEA) · pp. 1–10; footnote 1) “oil change”; consumption: WLTP values translated back to NEDC (provisional) · Accessed 08/10/2026
BMW (UK) Ltd. · EN · United Kingdom · Basic data summary (engine description B38A15M1 / B48A20T1); Motor: “Engine oil (exchange quantity)” · Accessed 08/10/2026
BMW (UK) Ltd. · EN · United Kingdom · pp. 1–2: dimensions compared with the predecessor, front-wheel-drive architecture, luggage capacity · Accessed 08/10/2026
BMW Group · EN · Europe (German base data) · pp. 1–18; footnote 1) oil change volume · Accessed 08/10/2026
BMW Group · EN · Europe (German base data) · pp. 1–18; footnote 1) oil change volume; consumption in NEDC and WLTP · Accessed 08/10/2026
BMW Group · EN · Europe (German base data) · Press release: chassis changes, output, WLTP consumption · Accessed 08/10/2026
BMW Group · EN · Germany · Press release: fourth generation in production, third-generation deliveries to end of June 2024 · Accessed 08/10/2026
BMW AG (online copy: Kfz-Handbuch.de) · DE · Germany · p. 182 (Servicebedarf), pp. 349–357 (Kraftstoff, AdBlue, Motoröl, Kühlmittel), pp. 360–361 (Condition Based Service, Service Historie) · Accessed 08/10/2026
BMW AG · DE · Germany · Section “Die Leistungen von BMW Service Inclusive” · Accessed 08/10/2026
ADAC · DE · Germany · Technische Daten: Motorcode, Leistung, Drehmoment, Modellstart/-ende, Baureihenende · Accessed 08/10/2026
ADAC · DE · Germany · Technische Daten: Motorcode, Leistung, Drehmoment, Modellstart/-ende, Baureihenende · Accessed 08/10/2026
ADAC · DE · Germany · Technische Daten: Motorcode, Leistung, Drehmoment, Modellstart/-ende, Baureihenende; Schadstoffklasse · Accessed 08/10/2026
BMW Group · EN · Europe · Press kit summary: 48-volt mild hybrid technology introduced with the fourth generation · Accessed 08/10/2026