2017–2021 BMW M240i Ownership Guide
Garage Guide Verdict:
🟢 Recommended
The BMW M240i is one of the best modern BMWs ever produced. Powered by the legendary B58 turbocharged inline-six, the M240i combines impressive reliability, luxury, strong aftermarket support, and outstanding performance. It delivers a true enthusiast driving experience while avoiding many of the ownership concerns associated with older BMW platforms.
🏆 Garage Guide Ownership Score
Overall Ownership Rating
🟢 8.8 / 10
🔍 Garage Guide Reliability Snapshot
🟢 Reliability: Good
🟡 Maintenance Cost: Average
🟢 Performance: Excellent
🟢 Modification Potential: Excellent
🟢 Daily Driver Suitability: Excellent
🟢 Long-Term Ownership: Good
📋 Buying Checklist
Vehicle History
✅ Clean title
✅ No major accidents
✅ Consistent maintenance records
✅ Verify service history
✅ No flood damage
Mechanical Inspection
✅ Verify turbocharger operation
✅ Inspect cooling system
✅ Check for oil leaks
✅ Verify transmission shifts smoothly
✅ Inspect suspension components
Modification Review
✅ Quality tuning documentation
✅ Professional installation records
✅ Supporting modifications present
✅ No signs of abuse or neglected maintenance
🏆 Best Model Years
🥇 2021 M240i
- Final production year
- Most refined platform
- Strong resale value
🥈 2020 M240i
- Mature B58 platform
- Excellent reliability
- Updated technology
🥉 2018 M240i
- Great value
- Proven drivetrain
- Lower purchase prices
⚠️ Proceed Carefully
Modified Vehicles
Many M240is are tuned. Verify tune quality and supporting modifications.
Cooling System
As mileage increases, inspect cooling components carefully.
Tire Costs
Performance tires wear quickly and can become expensive.
Deferred Maintenance
BMW ownership is rewarding when maintenance is performed consistently.
📊 Mileage Expectations
Under 50,000 Miles
🟢 Excellent
50,000–100,000 Miles
🟢 Excellent
100,000–150,000 Miles
🟢 Common
150,000–200,000+ Miles
🟡 Possible with proper maintenance
Tip: The B58 has become one of BMW’s most respected modern engines and has proven capable of very high mileage.
💰 Ownership Budget
Annual Maintenance Estimate
Oil Changes: $120–$350
Tires: $800–$1,800
Brakes: $400–$1,200
Misc. Maintenance: $600–$2,000
Estimated Annual Ownership Cost
$1,000–$5,000+
Depending on mileage, modifications, driving habits, and maintenance requirements.
🔧 BMW M240i Highlights
🏁 3.0L Turbocharged B58 Inline-6
🏁 335 Horsepower
🏁 Rear-Wheel Drive or xDrive AWD
🏁 8-Speed ZF Automatic Transmission
🏁 Luxury Interior
🏁 Huge Tuning Potential
🏁 Excellent Daily Driver
🏁 Strong Enthusiast Community
🏁 Ownership Score Summary
Pros
✅ Legendary B58 engine
✅ Outstanding tuning platform
✅ Excellent daily driver
✅ Premium interior quality
✅ Strong aftermarket support
✅ Available AWD
Cons
❌ Higher maintenance costs than Lexus
❌ Premium fuel required
❌ Tire replacement costs
❌ Modified examples require careful inspection
🌟 Vehicle Highlights
⭐ 3.0L B58 Turbocharged Inline-6
⭐ 335 HP / 369 LB-FT
⭐ Rear-Wheel Drive or xDrive
⭐ ZF 8-Speed Automatic
⭐ 0–60 MPH Under 4.5 Seconds
⭐ Luxury BMW Interior
⭐ Massive Aftermarket Support
⭐ One of BMW’s Most Reliable Modern Platforms
🏁 Garage Guide Final Verdict
The 2017–2021 BMW M240i is one of the best enthusiast luxury cars of the modern era. The B58 engine has earned a reputation for reliability, tunability, and performance that few turbocharged engines can match. Whether left stock or lightly modified, the M240i delivers a premium ownership experience with everyday practicality and serious performance potential.
🏆 Garage Guide Ownership Score
🟢 8.8 / 10
✅ Recommended
Build Smarter. Drive Longer.™