Thermostat M256 for Mercedes-Benz

OE-spec engine thermostat assembly, engineered for Mercedes-Benz vehicles with the M256 3.0L inline-6 petrol engine. Restores correct warm-up time and stable operating temperature, and helps protect against overheating and poor heater performance.

Key Features

• Precise Temperature Control: OE-matched opening temp and flow to stabilise engine and cabin heat.
• Integrated Housing and Seal: Direct bolt-on replacement to reduce leaks and comeback repairs.
• Correct Sensor/Actuator Logic: Works with the ECU for accurate warm-up and efficiency.
• Exact Fitment: Factory mounting points for a no-mod install.

Compatibility

Vehicles equipped with the M256 3.0T inline-6, including E-Class W213 (E450/AMG E53), CLS C257 (CLS450/AMG CLS53), S-Class W222 (late)/W223 (early trims), GLE W167/C167 (GLE450/AMG GLE53), GLS X167 (GLS450/AMG GLS53), and select G-Class W463 markets. 2WD and 4MATIC where applicable. Always confirm by VIN/OE number.

Note: Coolant, hoses, clamps, water pump, radiator, and extra sensors/hardware not included.

This is an aftermarket replacement part, not a genuine Mercedes-Benz product. Not affiliated with or endorsed by Mercedes-Benz Group AG.