Original BMW Turbocharger Oil Return Line for BMW M240i, 340i, 440i, 540i, 640i Gran Turismo, 740i, X3 M40i, and X4 M40i (2016–2021)

Built for the B58 six-cylinder, Original BMW oil return line 11-42-7-643-176 carries oil away from the turbocharger on 2016–2021 BMW M240i, 340i, 440i, 540i, 640i xDrive Gran Turismo, 740i, X3 M40i, and X4 M40i models. A turbo oil return line lets oil that has lubricated and cooled the turbocharger drain back to the engine. This BMW piece weighs 165 g (0.4 lb), went into production in July 2015, and is made in Serbia. Oil around the turbo or elsewhere in the engine bay can point to a cracked or leaking line. If oil flow through the turbo is restricted, it can run hot, wear quickly, and make whining, whistling, or grinding noises from poor lubrication.

Original BMW Parts carry a 24-month parts warranty.

One return line covers the B58 across two generations of BMW chassis, from the F-series 2, 3, and 4 Series to the G-series 5, 6 Gran Turismo, and 7 Series and the G01 X3 and G02 X4 M40i. BMW shows no earlier number for it and no left or right version, so the model and engine are what matter when ordering. It drains the turbo and does not feed it, so it is a different part from the turbo oil supply line.

Technical Details

• Manufacturer: BMW (Original BMW Parts)
• Part number: 11-42-7-643-176
• BMW part name: oil return line
• Weight: 165 g (0.4 lb)
• Production start: July 2015
• Country of manufacture: Serbia
• Engine: B58 six-cylinder
• Sold as one piece
• Warranty: 24 months

Common Questions

Is this the turbo oil supply or the return line?
It is the return line. BMW names it the oil return line, so it carries oil back from the turbo.

What symptoms suggest this line is failing?
Oil leaks around the turbo are the main sign. A restricted line can also leave the turbo running hot or making whining, whistling, or grinding noises.

Call PMB Performance for help sourcing other Original BMW B58 turbo hardware.

Fitment & Compatibility

Use the fitment table below to confirm the exact year, make, model, submodel, and any application notes before ordering. Send your VIN and PMB Performance will confirm the fit, drawing on more than 20 years in the trade.