The M4's high-performance engine generates significant heat, placing stress on the cooling system. Leaks can develop from hoses, the radiator, or the water pump, leading to overheating. Estimated repair cost: $500 - $1500.

The twin-turbocharged S55 engine is potent but can be susceptible to turbocharger wear. Issues can arise from oil supply lines, wastegate actuators, or the turbo bearings themselves. Estimated repair cost: $1500 - $3000+.

2018 BMW M4 Maintenance guide

Name: Maintenance dataset for 2018 BMW M4
Creator: Carfocal

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

MAINTENANCE SUMMARY

The 2018 BMW M4, with an average reliability score of 6.5, presents a maintenance profile marked by a substantial 67 Technical Service Bulletins (TSBs). Owners should prioritize addressing these TSBs, as they often indicate potential issues that may not yet be severe but could impact long-term reliability.

View Critical Issue: DCT Transmission Problems (If Applicable)

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Reliability Score

Est. Annual Maintenance Cost

$700 - $1,200

TSBs & Recalls

67 TSBs | 1 Recalls

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Key Takeaways

Proactive attention to the high number of TSBs is essential for long-term reliability.
Regular maintenance of the cooling system and turbochargers is critical.

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Critical service intervals

Common failure analysis

Symptoms and prevention guidance