A-Premium Crankcase Vent Valve Breather Hose Kit for BMW inline-six (E36/E46/E39/E83/E85) — complete direct-fit PCV replacement

The A-Premium Crankcase Vent Valve Breather Hose Kit is a complete PCV ventilation and oil-separator replacement designed to restore correct crankcase breathing on compatible BMW inline-six models.

If your BMW is showing oil leaks, rough idle, or oil-fouled intake components due to a worn or blocked PCV system, this A-Premium kit supplies the pipes, hoses and oil separator needed to return the system to proper operation. Built to match factory dimensions for selected E36, E39, E46, E83 and E85 models, the kit groups every service part into one package so you can replace the entire ventilation circuit at once.

Which BMW models does this kit fit and what should I check before buying?

This kit fits a range of BMW six-cylinder models across several chassis codes, including specific E36, E39, E46, E83 (X3) and E85 (Z4) years and engines. Confirm the exact engine code and production date on your vehicle and verify if your car was supplied without the Cold Weather Equipment option, since that variant may use different components.

• Compatible examples: E46 320i, 323i/323Ci, 325i/325Ci/325xi, 328i/328Ci, 330i/330Ci/330xi (selected years).
• Also covers E39/E60 525i/528i/530i and E83 X3, E36/Z3 and E85/Z4 2.5L and 3.0L inline-six variants listed by year.
• Check existing part numbers or service manual diagrams to confirm fit before ordering.

What components are included and how do they match the original parts?

The kit bundles the primary air-oil separator and the crankcase-to-valve-cover and crankcase-to-dipstick hoses, plus the return pipe used in the original ventilation loop. A-Premium engineers match dimensions to the factory parts to simplify installation and avoid custom modifications.

• Included parts: crankcase pressure regulator valve / oil separator and associated hoses and return pipe.
• Supplied part numbers mirror OEM references for easier cross-checking at installation.
• Designed for a direct, drop-in replacement where factory geometry applies.

How will replacing the PCV system with this kit benefit my engine performance?

Replacing failing ventilation parts reduces crankcase pressure, helps prevent oil leaks and limits oily deposits inside the intake tract that can affect idle quality and throttle response. While not a performance upgrade, restoring correct ventilation helps the engine run as intended and prevents secondary issues caused by excessive blow-by or clogged separators.

• Reduces crankcase pressure and oil seepage around gaskets and seals.
• Helps keep intake and valve-cover areas cleaner, reducing maintenance needs.
• Re-establishes factory air-oil separation to stabilize idle and combustion consistency.

Is installation difficult and what tools or skills are required?

Installation is straightforward for any technician or DIYer comfortable with basic engine bay work. The parts are engineered to match original fittings, so the job typically involves removing the old hoses and separator and replacing them with the new components supplied in the kit.

• Basic hand tools, pliers and possible screwdrivers or clamps are usually sufficient.
• Follow factory torque specs and inspect mounting points for wear before fitting.
• If uncertain, professional installation ensures proper routing and leak-free connections.

Who is this for: The A-Premium Crankcase Vent Valve Breather Hose Kit is aimed at BMW owners and independent technicians working on inline-six E36, E39, E46, E83 and E85 cars who prefer to replace the entire PCV circuit at once. It suits anyone addressing oil leaks, excessive engine bay fumes, or maintenance intervals where the original separator and hoses are aged or failing. If you need a single-sourcing replacement set that references OEM part numbers and is backed by a one-year unlimited-mileage warranty, this kit offers a convenient, factory-dimensioned option.