2020 BMW M340i B58B30M0/B58B30M1 (G20)
G20 / Sedan / Global (noting regional variations in engine output and emissions equipment)
B58B30M0B58B30M1Exact year/trim recordSilver
Engine identity
Oils and fluids
Service and parts data
Common and chronic problems
- Water pump and thermostat failures reported in some examples
- Vanos issues possible with high mileage
- Turbocharger wastegate rattle possible
First checks
- Oil level and condition due to direct injection and turbo
- Coolant system integrity for water pump leaks
- Transmission fluid level and condition
Before replacing parts
- Save fault codes and freeze-frame data before clearing anything.
- Check engine oil, coolant and transmission fluid using the correct temperature and service procedure.
- Verify power, ground, connectors, hoses, leaks and live data before replacing expensive parts.
Important notes
- Global markets have minor variations in power output linked to emissions regulations (e.g., EU vs. US)
- No manual gearbox option offered for M340i in 2020, only automatic
- Engine oil capacity includes filter change, BMW synthetic oils strongly recommended