Name: Compatible Thermostat M256 for Mercedes-Benz
SKU: 10603
Price: 3869.57 ZAR
Availability: OutOfStock

Compatible Thermostat M256 for Mercedes-Benz, Ref 2562000056

Engine thermostat assembly, designed for Mercedes-Benz vehicles with the M256 3.0L inline-6 petrol engine. Intended for engines with slow warm-up, unstable operating temperature, overheating or poor heater performance. Sold per unit, variant specific as supplied with housing and sensor where applicable.

What this is / isn’t:
Included: 1× thermostat assembly

Important: Match by VIN and engine code M256. Some models use different housings, outlet angles or electrical connectors. Cars with 48V EQ Boost and AMG 53 variants may use a specific spec. Always confirm by OE part number.

Key Features:

Temperature control: Opening temp and flow to stabilise engine and cabin heat.
Integrated housing and seal: Replacement to reduce leaks and comeback repairs.
Correct sensor/actuator logic: Works with the ECU for accurate warm-up and efficiency.
Materials: High-temp plastics and seals.
Fitment: Designed to use the existing mounting points.

Compatibility:
Vehicles equipped with the M256 3.0T inline-6, including, match by VIN/OE:

E-Class W213, E450 / AMG E53
CLS C257, CLS450 / AMG CLS53
S-Class W222 (late) / W223 (early trims), S450 / S500 where fitted with M256
GLE W167 / C167, GLE450 / AMG GLE53
GLS X167, GLS450 / AMG GLS53
G-Class W463 (select markets) with M256 petrol
Drivetrain: 2WD and 4MATIC where applicable.

Options, engine/sensor variations:

Standard M256 thermostat → conventional electronic-assisted stat with housing.
AMG 53 application → verify actuator and connector style, may differ.
Model year changes → later vehicles can use revised housings, match by VIN.

Always order by the exact OE part number on your vehicle or confirm via VIN.

Symptoms of a faulty thermostat:

Slow warm-up, temperature gauge stays low or fluctuates.
Overheating under load or at idle.
Weak cabin heat, fault code P0128 Or related temperature errors.
Coolant loss around housing, visible crusting or seepage.

Installation notes, pro tips:

Work only on a cold engine. Drain enough coolant to sit below housing level.
Replace the seal/O-ring, clean mating surfaces, torque bolts evenly to spec.
Refill with Mercedes-approved coolant, MB 325.x Spec, and bleed the system properly.
Check hose routing and clamps, clear stored codes after a road test.
Inspect adjacent components, pump, belt, radiator, for wear or leaks.

What’s included / not included:
Included: 1× Thermostat assembly with housing and seal, sensor/actuator if supplied
Not included: Coolant, hoses, clamps, water pump, radiator, extra sensors, hardware

Q&A
Q1: How do I confirm I have the M256 engine?
Check your VIN data card or engine cover, M256 is the 3.0L inline-6 turbo with 48V EQ Boost on many models. Your VIN will confirm the correct part.
Q2: Do I need coding after replacement?
Clear any stored fault codes and verify operating temperature.
Q3: Which coolant should I use?
Use Mercedes-approved coolant meeting MB 325.x Spec, mixed to the correct ratio.
Q4: Should I change anything else at the same time?
Inspect hoses and clamps, consider a fresh coolant service and new seal if not included.

Condition: New aftermarket replacement part. Not an original Mercedes-Benz part; brand and model names are used only to show fitment.