Febi 40991 Engine Oil Separator

Febi 40991 Engine Oil Separator

Febi 40991 is a plastic engine oil separator for select BMW applications. It is built for the 2006-2008 BMW Z4, 2006-2007 BMW 130i, 525i, 525xi, 530i, 530xi, 323i, 325i, 325xi, 330i, and 330xi, with fitment details that vary by model and production date. If you are replacing a BMW engine oil separator and want an OE-style service part, this Febi unit is listed for the applications shown below.

Key Features

• Brand: Febi febi
• Part number: 40991
• Engine oil separator for cylinder block component service
• Plastic construction
• Listed for select BMW 3 Series, 5 Series, and Z4 applications
• Cross-reference: BMW 11 61 7 531 423

Product Details

Febi 40991 is part of the febi product line, which focuses on replacement components built for European vehicle service needs. This engine oil separator is specified with a plastic material construction and is cataloged for BMW models including the 2006-2008 BMW Z4 and multiple 2006-2007 BMW sedan and xi variants. For buyers searching for a BMW engine oil separator 40991 or a Febi 40991 replacement, this listing provides direct fitment guidance by model and production year.

Fitment

• Fits 2006-2008 BMW Z4, N/A. Spring Design: Plastic; To Construction Year: 10/2006
• Fits 2006-2007 BMW 130i, N/A. Spring Design: Plastic
• Fits 2006-2007 BMW 525i, N/A. Spring Design: Plastic
• Fits 2006-2007 BMW 525xi, N/A. Weight (lbm / kg) 0.42; febi
• Fits 2006-2007 BMW 530i, N/A. Spring Design: Plastic
• Fits 2006-2007 BMW 530xi, N/A. Weight (lbm / kg) 0.42; febi
• Fits 2006 BMW 323i, N/A. Spring Design: Plastic
• Fits 2006 BMW 325i, N/A. Spring Design: Plastic
• Fits 2006 BMW 325xi, N/A. Weight (lbm / kg) 0.42; febi
• Fits 2006 BMW 330i, N/A. Spring Design: Plastic
• Fits 2006 BMW 330xi, N/A. Weight (lbm / kg) 0.42; febi

Common Replacement Reasons

• Oil separation service on BMW engines with crankcase ventilation issues
• Replacement for a cracked or aged plastic separator housing
• Addressing oil vapor control concerns in select BMW 3 Series, 5 Series, or Z4 models
• Restoring proper engine ventilation performance after separator wear

Installation Notes

Verify the BMW model, engine configuration, and production date before ordering, especially for the 2006-2008 Z4 application with the 10/2006 construction cutoff. Match the original part number 11 61 7 531 423 when confirming interchange, and compare the existing separator design to the listed plastic specification. Professional installation is recommended so the replacement is seated and routed correctly within the engine ventilation system.

Quality Assurance

Febi supplies replacement parts for European vehicle applications, and this oil separator is cataloged with direct BMW interchange information for accurate parts matching. Part number 40991 is listed for the applications shown above.