2026 BMW 4 Series maintenance schedule
Every service on the 2026 4 Series, with its interval and an estimated cost.
The 2026 BMW 4 Series oil change interval is every 10,000 mi or 12 months, whichever comes first (estimated cost $150-$250). Condition Based Service (CBS): change when the vehicle's service display calls for it. The CBS engine-oil interval is at most 10,000 miles or 12 months, whichever comes first; the display may call for it sooner depending on driving conditions (short trips, cold starts, idling, high engine speeds).
- Brake Fluid
- 24mo
- Cabin Air Filter
- 20,000mi
- ≈ 32,000km
- Engine Air Filter
- 40,000mi
- ≈ 64,000km
- Spark Plugs
- 60,000mi
- ≈ 97,000km
Service intervals
From the 2026 BMW 4 Series schedule. Rows marked “GarageHub estimate” are not taken from the manufacturer's maintenance schedule. Check your owner's manual for those.
| Service | Every | Est. Cost | Status |
|---|---|---|---|
| Engine Oil & FilterSafety itemCondition Based Service (CBS): change when the vehicle's service display calls for it. The CBS engine-oil interval is at most 10,000 miles or 12 months, whichever comes first; the display may call for it sooner depending on driving conditions (short trips, cold starts, idling, high engine speeds). | 10,000 mi / 12 mo≈ 16,000 km / 12 mo | $150-$250 | |
| Cabin Air FilterReplace the ventilation microfilter at every 2nd engine oil service (approx. 20,000 mi). Not shown in the CBS display; done together with the oil service. | 20,000 mi≈ 32,000 km | $40-$80 | |
| Engine Air FilterReplace the air filter element at every 4th engine oil service (approx. 40,000 mi); more often in dusty conditions. Not shown in the CBS display; done together with the oil service. | 40,000 mi≈ 64,000 km | $50-$90 | |
| Spark PlugsReplace at every 6th engine oil service (approx. 60,000 mi). Not shown in the CBS display; done together with the oil service. | 60,000 mi≈ 97,000 km | $250-$400 | |
| Brake FluidSafety itemTime-based only (no mileage): replace when the CBS display shows brake fluid due. BMW's CBS brake-fluid interval is 24 months after each change; the first change may be scheduled later, counted from the production date. | 24 mo | $120-$200 | |
| Brake InspectionInspect only. Front and rear brake pads are monitored by CBS (remaining miles shown); replace pads when displayed and check disc surface and thickness at that service. Brake lines and connections are checked at each CBS vehicle check. | As needed | — | |
| Engine CoolantNo scheduled replacement: the engine cooling system is factory-filled with long-term rated fluid; replacement is only necessary when repairs are performed; coolant level and concentration are checked at each CBS vehicle check. | As needed | $200-$350 | |
| Automatic Transmission FluidNo scheduled replacement: the 8-speed automatic transmission is factory-filled with long-term rated fluid; replacement is only necessary when repairs are performed. | As needed | $350-$500 | |
| Transfer Case Fluid (xDrive only)No scheduled replacement: the xDrive transfer case is factory-filled with long-term rated fluid; replacement is only necessary when repairs are performed, unless the vehicle's service system calls for it. | As needed | $300-$500 | |
| Tire Rotation & InspectionGarageHub estimateSafety item | 5,000 mi≈ 8,000 km | $40-$80 |
≈ converted from the other unit and rounded.
Est. costs are US-typical, in USD.
- 0 Due now
- 0 Within 5,000 mi
- 0 Later
Ask Rev about my 4 Series
GarageHub · Free · Your AI MechanicOpenThe 2026 BMW 4 Series (G22/G23/G26) spans the 430i, with a 2.0-liter turbocharged four-cylinder, and the M440i, with a 3.0-liter turbocharged inline-six, both mild hybrids and offered with rear-wheel drive or xDrive as a Coupe, Convertible or Gran Coupe. Maintenance follows BMW's Condition Based Service (CBS) system: the car's service display shows when each item is due, and a few items are done alongside the oil service. The M4 has its own schedule.
What happens if you skip it
- Skipping direct-injection carbon cleaning results in rough idle, misfires, and reduced boost pressure—walnut-blasting costs $400 but prevents $2,000+ injector/valve work.
- Ignoring xDrive transfer case fluid changes causes binding during tight turns and eventual $3,500+ transfer case replacement, documented on high-mileage G-chassis models.
- Overdue brake fluid degrades ABS modulator seals and boiling point, risking brake fade and $1,200+ ABS unit replacement.
Common issues at higher mileage
- 40,000+ mi
- Coolant expansion tank cracking on B48 I4 and B58 I6 engines, causing slow leaks and overheating warnings—plastic tank replacement runs $200-$400.
- 50,000+ mi
- xDrive front axle actuator motor failure presenting as 4WD malfunction warnings; replacement costs $800-$1,200 and is more common in cold climates.
- 60,000+ mi
- Turbocharger wastegate rattle on B58 I6 (M440i xDrive) during cold starts, often covered under powertrain warranty but requires turbo replacement if out of coverage.
- 70,000+ mi
- Oil filter housing gasket leaks on all engines, seeping onto exhaust and causing burning oil smell—gasket replacement is $150-$300 but prevents engine bay fires.
- 80,000+ mi
- Electric water pump failure on turbo engines, leading to sudden overheating; pump replacement costs $600-$1,000 and is a known wear item on BMW turbo platforms.
Common questions about the 2026 BMW 4 Series
How often does a 2026 BMW 4 Series need an oil change?
The 2026 BMW 4 Series oil change interval is every 10,000 mi or 12 months, whichever comes first (estimated cost $150-$250). Condition Based Service (CBS): change when the vehicle's service display calls for it. The CBS engine-oil interval is at most 10,000 miles or 12 months, whichever comes first; the display may call for it sooner depending on driving conditions (short trips, cold starts, idling, high engine speeds).
What maintenance does a 2026 BMW 4 Series need?
The services not to skip on a 2026 BMW 4 Series: engine oil & filter every 10,000 mi / 12 mo; brake fluid every 24 mo. The table above lists every service with its interval and an estimated cost.
What goes wrong on a BMW 4 Series at higher mileage?
What owners report as the miles add up — 40,000+ mi: Coolant expansion tank cracking on B48 I4 and B58 I6 engines, causing slow leaks and overheating warnings—plastic tank replacement runs $200-$400. 50,000+ mi: xDrive front axle actuator motor failure presenting as 4WD malfunction warnings; replacement costs $800-$1,200 and is more common in cold climates. 60,000+ mi: Turbocharger wastegate rattle on B58 I6 (M440i xDrive) during cold starts, often covered under powertrain warranty but requires turbo replacement if out of coverage. 70,000+ mi: Oil filter housing gasket leaks on all engines, seeping onto exhaust and causing burning oil smell—gasket replacement is $150-$300 but prevents engine bay fires. 80,000+ mi: Electric water pump failure on turbo engines, leading to sudden overheating; pump replacement costs $600-$1,000 and is a known wear item on BMW turbo platforms.
Keep this schedule for your 4 Series
Log what you've done, get reminded what's next. Rev knows the intervals for your 4 Series.