Oil Separator for BMW 540i 1998-2003 740i 740iL 1998-2001 4.4L Base-11151705272

Oil Separator for BMW 540i, 740i, and 740iL

This oil separator, referenced as part number 11151705272, routes crankcase vapors back into the intake to keep oil mist out of the combustion path on compatible BMW 4.4L models.

Overview

This oil separator serves as a direct replacement for the crankcase ventilation component, helping separate oil vapor from blow-by gases before they reach the intake. It is intended for BMW 540i and 740i 740iL models with the 4.4L engine across the listed production years. Keeping a healthy oil separator in place supports smoother running and cleaner intake components.

Built For Performance

• Matches OEM cross-reference 11151705272 for confident fitment
• Separates oil mist from crankcase vapors before they enter the intake
• Housing designed to handle constant exposure to hot oil vapor
• Connects to the factory vent and drain paths
• Sealed construction helps prevent vacuum leaks

Fits These Machines

• for BMW 540i 1998-2003 4.4L Base
• for BMW 740i 1998-2001 4.4L Base
• for BMW 740iL 1998-2001 4.4L Base

On-The-Job Use

• Replacing a clogged separator that causes oil consumption or smoke
• Routine crankcase ventilation maintenance on higher-mileage engines
• Resolving intake oil residue traced to a failed separator
• Restoring proper vacuum balance in the crankcase system

Specs At A Glance

Good To Know

Q: How do I know my oil separator needs replacing? A: Common signs include blue exhaust smoke, rising oil consumption, and oil residue in the intake tract. Q: Does this include mounting hardware? A: Check the listing contents carefully, since gaskets and fasteners are often sold separately for this type of part.

Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.