BMW E36 E46 M43 Crankcase Valve Intake Breather Valve Petrol Engine 1247133

BMW E36 E46 M43 Crankcase Valve Intake Breather Valve is a crankcase ventilation system component designed for BMW M43 series petrol engines. It is responsible for stable separation of oil vapors from gases, which supports smooth engine operation and reduces intake contamination. Thanks to a design consistent with BMW OE solutions, the part maintains the correct flow parameters for petrol-powered engines.

Specifications and technical data

• SKU: 7501567
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7503519
• Substitutable numbers: 11157501567, 7501567, 11151247133, 1247133
• Fuel type: Petrol
• Category: Other Air & Fuel Delivery

Function and application in the M43 engine

The oil separator plays a key role in the crankcase ventilation system, directing gases from the crankcase back into the intake while limiting the passage of oil mist. A properly functioning breather valve helps maintain:

• stable crankcase pressure,
• a cleaner intake and intake ports,
• smoother idle operation in a petrol engine,
• reduced carbon deposit buildup in the manifold and on the valves.

In M43 engines, using the correct oil separator is important for maintaining the proper air-fuel mixture and reducing engine oil consumption.

Design consistent with the Tappet and Valve Covers category

The presented element belongs to the Tappet and Valve Covers group, i.e., components operating in the immediate vicinity of the cylinder head and timing system. Placement in this zone requires resistance to:

• elevated operating temperatures of the petrol engine,
• contact with engine oil vapors,
• pressure changes in the ventilation system.

Thanks to this, the oil separator and breather valve can effectively work with the valve cover and breather hoses, maintaining the correct direction of gas flow.

Product characteristics and fitment

The offered element is a BMW brand part, which means compatibility with factory mounting geometry and the routing of breather hoses in M43 units. This facilitates installation in place of a worn component without the need for system modifications.

The product is in used condition, which allows for an economical replacement while maintaining the original design. For petrol engines, it is important that the oil separator maintains tightness and the correct flow characteristics – replacing a worn element with a functional unit helps reduce problems such as unstable idle, excessive smoke, or oil leaks in the breather area.

Benefits of a properly functioning breather in BMW E36/E46

A functional crankcase ventilation system in a BMW with an M43 engine translates into a number of practical operational benefits:

• more predictable engine behavior when cold and warm,
• reduction of oil blow-by into the intake system,
• lower risk of leaks through shaft seals and valve covers,
• better operating conditions for the ignition system and lambda sensor.

For users who want to keep their petrol engine in good technical condition, regular inspection and potential replacement of the oil separator and breather valve is one of the basic maintenance tasks.

If you are planning a comprehensive repair or upgrade of the engine area in your BMW and need other elements from the same group, such as covers, housings, or additional protective elements, check out the available parts in the BMW Tappet and Valve Covers category.

How to select the correct breather and oil separator

To precisely match this element to a specific version of the BMW E36 or E46 with an M43 engine, it is worth using the OEM number and interchangeable numbers assigned to the part. This allows you to avoid mistakes between variants used in different engine configurations and model years.

If you want to verify the compatibility of the part with your car's VIN number step-by-step and compare manufacturer markings, a practical guide will be helpful: Guide: how to select the right car part by VIN and OEM number. Thanks to it, you will more easily confirm the compatibility of the offered oil separator with your BMW unit.