Turner Motorsport Baffled Oil Catch Can / Air-Oil Separator (AOS) PCV Catch Tank with Drain Kit for BMW S55 - F80 F82 F83 M3 M4 Crankcase Breather Upgrade

Keep your BMW S55 breathing clean and performing consistently

Stop oily blow-by from re-entering your intake on the F80 F82 F83 M3 and M4. This Turner Motorsport oil air separator kit captures mist and moisture from the positive crankcase ventilation system, helping to minimise sludge, reduce intake valve deposits and keep charge pipes and the intercooler cleaner. Ideal for spirited road use and track days, it is an OEM-plus solution that supports reliability and smooth running without any tuning changes.

Why enthusiasts choose this PCV catch tank

• Four-stage internal baffling maximises oil and water vapour separation to keep fumes out of the intake tract.
• CNC machined 6061-T6 aluminium canister, black anodised for durability and a factory look.
• Integrated dipstick with O-ring makes checking the reservoir quick and clean.
• Serviceable design with removable plates and supplied 2.5 mm hex key for easy maintenance.
• Closed recirculating layout for emissions-friendly, odourless operation.
• Vehicle-specific mount positions the unit neatly on the passenger side of the S55 engine bay.
• Moulded silicone hoses deliver a tidy, no-cut install that looks factory.
• Supplied drain kit with valved line enables effortless emptying from below the car, perfect for the tight packaging around the S55.

The result Less contamination in the intake runners, cleaner valves on direct injection engines, reduced gunk in vacuum lines and a more consistent driving experience. Our team has fitted these regularly and we also run this hardware ourselves. Feedback from MJ Modifications customers has been excellent, with noticeably cleaner plumbing after sustained mileage.

Fitment BMW M3 and M4 with the S55 twin-turbo engine on the F8x platform. Right-hand drive and left-hand drive friendly passenger-side bracket design.

Installation Want it fitted by specialists We recommend professional installation at MJ Modifications in Warwickshire. For a fitting quote, email info@mjmodifications.co.uk.

What is included

• Oil air separator canister with multi-stage internal baffles
• S55-specific passenger-side mounting bracket
• Moulded silicone hoses
• Drain setup with valve for underbody emptying
• Dipstick with seal and 2.5 mm Allen key

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