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The BN B58 4AN Oil Feed Fitting is the clean, no-guesswork solution for anyone building a custom oil feed line on BMW B58 platforms. This fitting is purpose-designed to work on both the engine block oil feed port and the stock or hybrid turbocharger bearing housing, allowing you to run a single, consistent 4AN oil feed setup from end to end.
Whether you’re installing a Turbosmart OPR (Oil Pressure Regulator), upgrading to a hybrid turbo, or simply ditching the restrictive factory hard line, this fitting gives you the flexibility and reliability needed for a proper oiling solution.
Why This Fitting Exists
The factory B58 oil feed system was never designed with external regulators or custom turbo setups in mind. The BN 4AN oil feed fitting eliminates that limitation by providing a direct, secure 4AN interface at both critical connection points—no adapters stacked on adapters, no questionable sealing.
Key Features
- Designed specifically for BMW B58 engines
- Fits engine block oil feed port
- Fits stock and hybrid turbo bearing housings
- Allows full custom 4AN oil feed line routing
- Ideal for Turbosmart OPR installations
- CNC-machined for precise fit and reliable sealing
- Eliminates factory hard line restrictions
- Clean, serviceable, motorsport-grade solution
Perfect For:
- Turbosmart OPR installs
- Custom turbo builds
- Hybrid turbo upgrades
- Track and high-power B58 applications
- Anyone wanting a cleaner, more flexible oil feed setup
If you’re modifying your B58 beyond basic bolt-ons, oil control matters. The BN B58 4AN Oil Feed Fitting gives you the foundation to do it right—simple, reliable, and built for real-world performance.
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