The B58 engine, while generally robust, can be susceptible to cooling system component failures, particularly the **water pump** and **thermostat housing**. Leaks can lead to overheating and potential engine damage. Estimated repair cost: $400 - $1,200.

Electrical System Glitches

A high TSB count (99) suggests potential for various electrical gremlins. Issues can range from minor sensor faults to more complex module malfunctions, often manifesting as warning lights or erratic system behavior. Estimated repair cost: $200 - $1,000+.

Front Seat Belt Retractor

A recall (17V507000) addressed a potentially defective Emergency Locking Retractor (ELR) mechanism in the front seat belts. While addressed by recall, it's critical to ensure this was completed. Estimated repair cost: Covered by Recall.

CARFOCALvehicle research

2018 BMW 440i Maintenance guide

Name: Maintenance dataset for 2018 BMW 440i
Creator: Carfocal

v1.0Updated Jul 4, 2026Ryan Davis4 Sources Analyzed

MAINTENANCE SUMMARY

The 2018 BMW 440i, with its 3.0L 6-cylinder engine and 8-speed automatic transmission, presents an average reliability profile (6.8/10). A high TSB count (99) suggests potential for underlying technical issues, warranting proactive inspection beyond standard maintenance.

View Critical Issue: Cooling System Leaks

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Reliability Score

Est. Annual Maintenance Cost

$400 - $700

TSBs & Recalls

99 TSBs | 1 Recalls

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Key Takeaways

Proactive inspection of cooling system components is recommended due to potential leaks.
Monitor for electrical system anomalies, as indicated by a high TSB count.

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Critical service intervals

Common failure analysis

Symptoms and prevention guidance