Description
The BMS B58 Oil Catch Can Oil Filler Cap Dual Vent Connection Kit is a precision-engineered upgrade designed to unlock the full potential of your B58 BMW or Toyota Supra crankcase ventilation system. This kit provides a true dual-vent PCV solution, allowing your oil catch can to capture significantly more oil vapor, blow-by gases, and harmful contaminants before they enter the intake tract.
At the heart of the system is a CNC-machined billet aluminum oil filler cap that replaces the factory cap and adds a second dedicated breather outlet. With both the crankcase vent and valve cover breather routed into your oil catch can, this dual-input configuration dramatically improves vapor capture efficiency. The result is cleaner combustion air, reduced oil mist in the intake, and better long-term engine protection—especially on tuned or high-boost B58 setups.
By improving crankcase evacuation, this system helps create a slight negative pressure (vacuum) within the crankcase, reducing piston resistance during operation. This can improve engine efficiency, throttle response, and overall performance, while also reducing pressure buildup caused by blow-by gases.
Designed specifically to integrate with the BMS B58 Oil Catch Can system, this kit is the missing link for enthusiasts looking to maximize PCV performance. Installation is clean and straightforward, with all required fittings, hoses, and clamps included for a secure, professional-grade setup.
Why This Upgrade Matters
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True Dual-Vent PCV System
Adds a second breather port to pull more blow-by gases into your catch can. -
Maximized Oil Vapor Capture
Twice the venting means significantly improved oil mist and contaminant control. -
Reduced Crankcase Pressure
Helps manage blow-by gases and reduces stress on seals and internal components. -
Improved Engine Efficiency
Lower piston resistance through mild crankcase vacuum improves performance and fuel efficiency. -
Cleaner Intake & Valves
Reduces oil vapor recirculation that leads to carbon buildup on intake valves. -
Ideal for Tuned & High-Boost Builds
Especially beneficial for modified B58 engines producing increased crankcase pressure.
Features & Construction
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CNC-machined billet aluminum oil filler breather cap
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Direct replacement for factory oil filler cap
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Designed specifically for BMS B58 oil catch can systems
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High-temperature silicone hose for durability
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Complete hardware kit for clean, secure installation
Vehicle Fitment
BMW 2 Series
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2022+ BMW M240i / M240i xDrive (G42)
BMW 3 Series
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2019+ BMW M340i / M340i xDrive (G20, G21)
BMW 4 Series
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2021+ BMW M440i / M440i xDrive incl. Gran Coupe (G22, G23, G26)
Toyota
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2020–2026 Toyota GR Supra Mk5 B58 3.0L Inline-6
What’s Included
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(1) BMS B58 CNC Billet Oil Filler Breather Cap
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(1) -12 ORB 90° to -12AN fitting
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(1) -12AN straight barbed fitting
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(1) Heavy-duty custom silicone hose
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(1) Barbed PCV T-fitting
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(3) Hose clamps
The standard shipping rate applies to orders within the continental United States. If you intend to place an order outside of the continental US, please reach out to support@x-ph.com for assistance.
