⚠️ BMW manufacturer position
BMW ISTA tank drain and module service; warranty excludes fuel contamination damage.
Vehicle information
| Make | BMW |
|---|---|
| Model | M5 |
| Market status | Sold new in the US 1988–present (including Competition models) |
| Body styles | Sedan |
| Generations | F10 (2013–2016), F90 (2018–2023), G90 (2025–present) |
| Engine options | Gasoline: Twin-turbo V8 (S63); 91–93 AKI premium Hybrid: M5 Touring PHEV where offered—verify US listing |
| Fuel tank capacity | 20.6 gal (varies by generation) |
| Fuel system | Gasoline direct injection, dual HPFP on V8 |
| Access method | Fuel pump module access — location per ISTA (often under rear seat) |
| Anti-siphon | Yes |
| Service portal | BMW ISTA / BMW TIS (aos.bmwgroup.com) |
Misfuel risk Moderate
Gasoline performance sedan; diesel misfuel is unlikely but severe if it occurs.
If the engine was not started
Do not start; full tank drain required.
If the engine was started
Assume HPFP, injectors, and exhaust aftertreatment 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.
Frequently asked questions
What should I do if I put the wrong fuel in my BMW M5?
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 M5?
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 M5 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