⚠️ BMW manufacturer position
Follow BMW ISTA fuel tank service; misfuel excluded from warranty.
Vehicle information
| Make | BMW |
|---|---|
| Model | M4 |
| Market status | Sold new in the US 2015–present |
| Body styles | Coupe, Convertible |
| Generations | F82/F83 (2015–2020), G82/G83 (2021–present) |
| Engine options | Gasoline: Twin-turbo I6 (S55/S58); premium gasoline required |
| Fuel tank capacity | 15.6 gal typical |
| Fuel system | Gasoline direct injection (HPFP) |
| Access method | Rear-seat fuel pump access on many chassis — consult ISTA |
| Anti-siphon | Yes |
| Service portal | BMW ISTA / BMW TIS (aos.bmwgroup.com) |
Misfuel risk Moderate
US M4 is gasoline-only; drain fully if diesel or E85 was added against owner manual.
If the engine was not started
Ignition OFF; tow for drain.
If the engine was started
Plan for HPFP/injector and catalyst inspection.
Access procedure
- Disconnect the negative battery terminal and confirm ignition is OFF.
- Release fuel pressure per OEM procedure (relay/fuse or scan tool command—do not crank if wrong fuel is present).
- Access the fuel pump/sender module per BMW ISTA repair instructions (often under rear seat or trunk floor).
- Drain the tank using OEM-approved fuel transfer equipment connected at the module or service ports.
- Replace fuel filter and inspect lines; flush or replace components per contamination severity and BMW guidance.
- Reinstall module, reconnect battery, prime the fuel system, and check for leaks before road test.
Related models
- M3
- 4 Series
Frequently asked questions
What should I do if I put the wrong fuel in my BMW M4?
Do not start the engine or cycle the ignition to RUN if the fuel pump may prime. Have the vehicle recovered to a USIFDA Certified Repair Facility and follow BMW service information for tank draining and fuel system inspection.
Does BMW warranty cover misfuel damage on a M4?
No. BMW warranties exclude damage from improper or contaminated fuel. Repairs are typically customer-pay; document the OEM-prescribed remediation procedure.
Can fuel be removed from a M4 through the filler neck?
BMW documents fuel recovery via the fuel pump module access and/or tank removal using approved equipment—not filler-neck siphoning. Follow ISTA/TIS or erWin procedures for your model year.
Need professional misfuel recovery?
Find a certified operator or read consumer guidance for your next steps.
Find an operator Consumer guidance