BMW B48 / B58 Turbo Coolant & Oil Fitting – -6AN to O-Ring

Simplify your custom turbo plumbing with the STROM Motorsports BMW B48 / B58 Coolant & Oil Turbo Fitting, designed to convert the factory-style engine connection to a convenient -6AN fitting.

Developed primarily for BMW B48 turbo engines, this fitting provides a clean solution for custom oil feed and turbo coolant line installations, making it particularly useful for B48 engine swaps, upgraded turbo systems, race cars and custom motorsport builds.

The fitting features a -6AN connection on one end and a 12.15mm O-ring connection on the other, allowing it to install into the factory engine connection while providing a standard AN interface for custom hose assemblies.

Designed for BMW B48 Turbo Oil & Coolant Lines

These fittings are designed to replace the connections associated with factory BMW hoses:

• 11538629971

• 11428629969

On the BMW B48 engine, the fittings can be used at two key turbo plumbing locations:

• Front of the engine block for the turbo oil feed line

• Right side of the engine block for the turbo coolant / water return line

This makes them especially useful when replacing the factory hard lines or hoses with custom AN plumbing.

-6AN Connection for Custom Turbo Plumbing

The fitting converts the original BMW connection to a standard -6AN interface, making it easier to fabricate custom braided or motorsport-style turbo lines.

Using an AN connection gives builders greater flexibility when routing oil and coolant lines in applications where the factory B48 plumbing may no longer be suitable.

This is particularly beneficial for:

• B48 engine swaps

• Custom turbo installations

• Upgraded turbocharger systems

• Race and track cars

• Motorsport applications

• Custom engine bay layouts

Factory-Style O-Ring Connection

The engine side of the fitting measures 12.15mm and uses an O-ring seal, providing compatibility with the applicable factory B48 engine ports.

The fitting is retained using the factory bolt hole, providing a clean installation without requiring unnecessary modifications to the engine block.

B48 & B58 Compatibility

The fitting is designed primarily for BMW B48 turbo engines.

STROM notes that it may also work with B58 applications. Because B58 configurations can vary, fitment should be confirmed against the dimensions and factory connection on your specific engine before ordering.

Ideal for B48 Engine Swaps & Custom Turbo Builds

Factory BMW turbo plumbing is designed around the original chassis and engine bay configuration. When installing a B48 into another vehicle or modifying the turbo system, the original hoses may become difficult or impractical to use.

The STROM Motorsports BMW B48 / B58 -6AN Turbo Coolant & Oil Fitting provides a simple way to transition from the factory engine connection to standard AN plumbing, giving builders greater freedom when designing custom turbo oil and coolant lines.

Important Ordering Information

Price is for one fitting (quantity 1).

If your installation requires fittings for both the turbo oil feed and coolant return connections, ensure that you order the required quantity.

Always verify your engine, factory hose connection and required fitting dimensions before ordering.