BMW N54 Turbo Coolant Return Line / Water Return Tube (Cyl 1-3 Bank 1 Front Turbo) OEM 11537558900 - Fits 135i 335i 535i 740i Z4 35i/35is X6 35i - E60 E82 E88 E90 E91 E92 E93 F01 F02 E71 E89 - Turbo Water Outlet Pipe Coolant Hardline / Hose Genuine

BMW N54 Turbo Water Return Tube for Cylinders 1-3 - OE Ref 11537558900

Restore rock-solid cooling performance on your N54 twin-turbo engine with this authentic BMW water return tube for the forward turbocharger bank (cylinders 1 to 3). If you are chasing down a coolant weep around the turbo area, smelling coolant after a spirited drive, or refreshing ageing hard lines during turbo service, this factory replacement line delivers exact fit, long service life and peace of mind.

We have fitted this part on customer cars and our own builds with superb results. Expect a precise seal, proper routing and OE reliability that helps prevent overheating and protects your turbos. Ideal as a preventative maintenance item during wastegate, manifold or cooling system work on N54-powered models.

Why this OE BMW return line is the right choice

• Original BMW component for perfect alignment and sealing on the front turbo bank
• Direct swap for the factory coolant backflow tube on N54 applications
• Helps eliminate drips, residue and hot-side coolant smells around the turbine housing
• Trusted by MJ Modifications and our customers for leak-free results
• Great to install alongside new gaskets, O-rings and fresh coolant during service

Part number

11537558900 (also referenced as 11 53 7 558 900)

Vehicle coverage

Suitable for the following BMW models using the N54 engine and the cylinder 1-3 turbo bank return line:

• 1 Series
  • E88 Convertible: 135i
  • E82 Coupe: 135i, 135is where applicable
• 3 Series
  • E90 Saloon and E90 LCI: 335i, 335ix
  • E91 Touring and E91 LCI: 335i, 335ix
  • E92 Coupe and E92 LCI: 335i, 335ix, 335is
  • E93 Convertible and E93 LCI: 335i, 335is
• 5 Series
  • E60 LCI: 535i, 535ix
  • E61 LCI: 535ix
• 7 Series
  • F01: 740i
  • F02: 740Li
• X Series
  • E71 X6: xDrive35i
• Z Series
  • E89 Z4: sDrive 35i, sDrive 35is

Common searches and related phrases

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Fitting and support

Professional installation recommended. Book fitting with MJ Modifications in Warwickshire. Request a quote at info@mjmodifications.co.uk.

Compatibility check

We can confirm fitment before dispatch. Add your UK registration or the last 7 of your VIN at checkout so we can verify this line suits your chassis and engine variant.

Manufacturer and warranty

Manufacturer: BMW

Warranty: Two years manufacturer warranty for UK customers and one year for international customers when a VIN is provided at checkout on compatible vehicles.

Why buy from MJ Modifications

• We supply and install genuine and OE-quality performance parts daily
• Real workshop experience with N54 cooling and turbo hardware
• Happy customers reporting leak-free operation and restored confidence