2016 MERCEDES-BENZ S-Class M278 DE 46 LA (S 550/S 560, North America)/M276 DE 30 LA (S 400 hybrid, selected markets) (W222)

Engine identity

Oils and fluids

Service and parts data

Common and chronic problems

• Air suspension leaks and repairs
• Electronic control unit software issues (varies by module)
• Timing chain wear on some V8 engines

First checks

• Verify complete service history especially for air suspension
• Check for active fault codes via Mercedes diagnostic tools
• Inspect for leaks in oil cooler and turbochargers on diesels

Vor dem Teiletausch

• 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

• Markets like North America predominantly feature the M278 V8 engine (marked S 550 or S 560 in 2017+).
• Diesel variants are primarily sold in Europe and some other selected markets.
• Hybrid powertrain availability varies by market; S 400 hybrid offered mainly in Europe and Asia.
• Oil capacity includes filter change service-fill estimates.
• Timing chain drive noted as reliable but timing guides may wear on V8 engines.