Oil Separator Pipe BMW E60 E87 LCI E90 N43 Adapter Plate 70307814

The BMW E81 E82 E90 E91 Crankcase Ventilation Hose Air Manifold is a component from the intake manifolds category, designed for the crankcase ventilation system in BMW engines. It ensures proper oil vapor discharge into the intake system, supporting stable engine operation and reducing manifold contamination.

Specifications and technical data

• SKU: 70307814
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 70307814
• Substitutable numbers: E92N E93 E93N, 11617561386, 7561386, 70307814
• Category: Intake Manifolds

Purpose and Role in the Intake System

The crankcase ventilation hose for BMW E81, E82, E90, and E91 series models connects the crankcase ventilation system to the intake manifold. This directs oil vapors back into the intake, which:

• stabilizes crankcase pressure,
• reduces oil leaks and engine "sweating,"
• contributes to smooth engine operation across the entire RPM range.

A properly selected crankcase ventilation hose helps maintain the efficiency of the intake system and reduces the risk of engine operational disturbances caused by leaks or clogged hoses.

Compatibility with BMW Platforms

The offered hose is designed for popular BMW models from the E8x and E9x families, including hatchback and sedan/wagon body variants. The hose's construction is adapted to the engine bay geometry of these generations, facilitating installation and ensuring correct routing of the hose relative to the intake manifold and other ancillary components.

By using a solution that complies with factory specifications, the hose integrates with the intake system without requiring modifications, maintaining the original oil vapor flow path.

Characteristics of a Used Part

The crankcase ventilation hose is offered as a used part, providing a cost-effective solution for users seeking an economical alternative to new OEM components. This type of part allows for restoring proper airflow in the ventilation system when the existing hose has cracked, delaminated, or lost its flexibility.

Choosing a used hose is particularly sensible for maintenance repairs on older BMW generations where a reasonable balance between cost and functionality is desired, while maintaining compatibility with the original intake manifold design.

Benefits of Replacing the Crankcase Ventilation Hose

Regular inspection and, if necessary, replacement of the crankcase ventilation hose can mitigate common issues associated with the intake system in BMW engines. Using a functional hose can contribute to:

• reducing the risk of rough idling caused by leaks,
• limiting excessive oil contamination inside the intake manifold,
• maintaining stable air-fuel mixture parameters.

This is a practical solution for users who want to consciously care for their intake system and crankcase ventilation without altering the engine's construction.

BMW Intake Manifolds – Part Selection and Technical Knowledge

If you are looking for other components from the BMW intake manifolds category, check out the BMW intake manifolds available in our store to select components tailored to your car's specific generation and engine version.

Want to better understand the relationships between the manifold, crankcase ventilation hoses, and the rest of the system? See our guide on the blog: performance exhaust systems and used manifolds in BMW, where we discuss practical aspects of selecting and operating manifolds in premium cars.