The **water pump** and **thermostat housing** are known failure points, leading to coolant leaks. This can cause overheating and potential engine damage if not addressed promptly. Estimated repair cost: $500 - $1500.

Ignition System Failures

**Ignition coils** and **spark plugs** can fail prematurely, leading to misfires and rough running. This is often exacerbated by age and mileage. Estimated repair cost: $400 - $800.

Oil Leaks (Valve Cover Gasket)

The **valve cover gasket** can degrade over time, leading to oil leaks onto exhaust components or the engine block. This can cause smoke and a burning oil smell. Estimated repair cost: $500 - $1000.

CARFOCALvehicle research

2016 BMW 640i Maintenance guide

Name: Maintenance dataset for 2016 BMW 640i
Creator: Carfocal

v1.0Updated Jul 4, 2026Ethan Miller4 Sources Analyzed

MAINTENANCE SUMMARY

The 2016 BMW 640i presents an average reliability profile, with a notable 114 TSBs indicating potential for minor issues. Owners should prioritize proactive checks of the cooling system (water pump, thermostat) and ignition components (coils, spark plugs) to mitigate common failures.

View Critical Issue: Cooling System Leaks

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Reliability Score

Est. Annual Maintenance Cost

$1,000 - $2,000

TSBs & Recalls

114 TSBs | 0 Recalls

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Key Takeaways

The 2016 BMW 640i has an average reliability rating, underscored by a high TSB count.
Focus on preventative maintenance for the cooling system and ignition components.

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Critical service intervals

Common failure analysis

Symptoms and prevention guidance