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BMW

Genuine BMW N54 Front Turbo Coolant/Water Feed Pipe Hardline (Bank 1 Cyl 1-3) - Turbocharger Coolant Supply Line OE 11537558899 (11 53 7 558 899) - Fits 135i 335i/335xi/335is 535i/535xi 740i Z4 35i/35is - E82 E88 E90 E91 E92 E93 E60 E61 F01 F02 E89

Genuine BMW N54 Front Turbo Coolant/Water Feed Pipe Hardline (Bank 1 Cyl 1-3) - Turbocharger Coolant Supply Line OE 11537558899 (11 53 7 558 899) - Fits 135i 335i/335xi/335is 535i/535xi 740i Z4 35i/35is - E82 E88 E90 E91 E92 E93 E60 E61 F01 F02 E89

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Heads-up on cancellations & returns: if you cancel an order or return an item, you won't get back 100% of what you paid. We apply a 10% restocking fee, the outbound shipping is non-refundable, and we have to pass on Shopify / PayPal payment processing fees; these aren't returned to us when we refund you. International orders also lose on exchange-rate spread in both directions. If the original packaging is damaged or missing, a reboxing charge applies. For international orders specifically, if you refuse to pay our shipping invoice or supply a prepaid label after placing the order, the same deductions apply. We're upfront about this — please be sure of your purchase before ordering.

BMW N54 Front Turbo Water Feed Hardline - Cyl 1 to 3 - OE 11537558899

Keep your twin-turbo straight-six running cool and dependable with this genuine BMW hard line that carries coolant to the forward turbocharger on the N54. This OE metal pipe services cylinders 1 to 3 and is the direct factory replacement for vehicles such as 135i, 335i, 535i, 740i and Z4 35i or 35is. If you are chasing a coolant smell, dampness around the turbo area or low coolant warnings, this is the proven fix that restores proper thermal control and protects your turbos.

We use this exact OE part on our own cars and customer builds and it delivers perfect fitment, correct routing and long-term reliability. Ideal when changing turbos, water pump or carrying out cooling system maintenance, and essential preventative maintenance on higher mileage N54 engines.

Why this OE hard line is the right choice

  • Authentic BMW component for the forward turbo water feed on N54 engines
  • Direct swap with factory pipe - no modifications required
  • Precise bends and connectors for leak-free operation and optimal coolant flow
  • Helps prevent overheating and limp mode under spirited driving or track use
  • Trusted by enthusiasts - proven on our shop cars and customer vehicles

Part number

11537558899 - also referenced as 11 53 7 558 899

Fits the following BMW models with the N54 engine

  • 1 Series - E82 and E88 - 135i
  • 3 Series - E90 E91 E92 E93 - 335i 335ix and 335is
  • 5 Series - E60 E61 - 535i and 535ix
  • 7 Series - F01 F02 - 740i
  • Z4 - E89 - sDrive35i and 35is

When to replace

  • Coolant smell after a drive or visible residue near the front turbo
  • Intermittent coolant loss with no obvious radiator or hose leaks
  • Car entering reduced power due to excessive heat under load
  • Any turbo replacement or cooling system overhaul on an N54

Fitting and workshop support

Professional installation recommended. MJ Modifications in Warwickshire offers expert fitting and cooling system checks for N54-powered cars. Request a quote: info@mjmodifications.co.uk. Many technicians also renew the sealing rings during installation for best results.

Compatibility check

We can verify fitment before dispatch. Add your UK registration or the last 7 of your VIN at checkout to confirm this OE 11537558899 front turbo water feed line is right for your vehicle.

Warranty

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

Search-friendly terms

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