Breather Valve Mercedes R170 W202 M111 Petrol Vacuum Solenoid Valve A1110180335

Breather Valve Mercedes R170 W202 M111 Petrol Vacuum Solenoid Valve is a crankcase ventilation system component designed for petrol engines, which stabilizes crankcase pressure and limits oil from entering the intake system. Thanks to its factory design for the Mercedes brand, it ensures proper engine operation, reduction of deposits, and smooth engine performance.

Specifications and technical data

• SKU: A1110180335
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1110180335
• Substitutable numbers: A1110180335, A 111 018 03 35
• Fuel type: Petrol
• Category: EGR Parts & Valves

Purpose and technical function

The described oil separator breather valve is part of the crankcase ventilation system in M111 series petrol engines used in Mercedes R170 and W202 models. Its task is the controlled discharge of gases from the crankcase, separation of oil mist, and directing purified vapors into the intake system, which promotes stable engine operation.

A properly functioning valve in this configuration:

• limits excessive oil consumption through more effective vapor separation,
• reduces the risk of intake manifold and throttle body contamination,
• supports smooth idle operation and correct throttle response,
• helps maintain proper crankcase pressure, which is essential for seal durability.

Benefits of using an original component

In petrol engine ventilation systems, the precision of the valve's operation has a direct impact on performance and exhaust emissions. Using an original solution dedicated to Mercedes allows for maintaining factory flow parameters and opening characteristics, which is particularly important in M111 units.

The main advantages of installing this valve include:

• Compatibility with the M111 engine ventilation system – perfect fit for the factory oil separator and vacuum lines,
• Stable petrol engine operation – reduction of idle fluctuations and air-fuel mixture issues,
• reduction of carbon deposit buildup in the intake,
• maintenance of correct exhaust gas recirculation system parameters within the EGR valves and parts group.

Component condition and installation aspects

The offered valve comes from disassembly and is intended for reinstallation in Mercedes vehicles with the M111 petrol engine. This type of part, with proper use, retains its functional properties for a long time, providing an economical solution compared to unreliable aftermarket replacements.

Before installation, it is recommended to:

• verify the tightness of the ventilation hoses and oil separator,
• check the condition of the ports and connections,
• check the correct operation of the vacuum system after installation.

Integration with the powertrain and durability

A functional oil separator breather valve affects the overall condition of the powertrain – from engine stability to the load on the lubrication system. Combined with regular oil and filter changes, it helps reduce the risk of blow-by, leaks, and excessive exhaust smoke.

If your car shows symptoms such as increased oil consumption, unstable idle speed, or an oily intake, replacing this component may be one of the key diagnostic and service steps.

If you are planning a comprehensive repair or upgrade of the engine area in your Mercedes and need other components from the same group, such as control valves, vacuum lines, or exhaust gas recirculation elements, check the available parts in the Mercedes EGR valves and parts category.

For a better understanding of the impact of original components on powertrain durability and the cost-effectiveness of using used OEM parts, it is worth reading the article: Humming differential? Find out why a used OEM drive axle is a better investment than an uncertain replacement.