AMS Performance Alpha Air/Oil Separator | 2009-2024 Nissan GT-R R35

The AMS Performance Alpha Air/Oil Separator (part number ALP.07.04.0023-1) keeps oil vapor from the crankcase out of the intake tract on the 2009-2024 Nissan GT-R R35. The factory PCV system routes blow-by straight back into the intake, so even a stock GT-R builds an oil film in its intake pipes. Add boost, ethanol fuel or a built engine and the problem grows quickly, often ending with oil coming out of the blow-off valves.

Oil vapor in the intake charge costs power, and by changing the air/fuel ratio it can even lead to harmful detonation. The Alpha separator catches that oil before it reaches the turbos and combustion chambers, so the intake stays dry and the engine sees clean air.

Unlike a basic catch can that has to be emptied by hand, the Alpha unit drains the collected oil back to the oil pan through a check-valve fitting. There is nothing to drain, and no risk of the can overfilling into the engine bay or slowly lowering the oil level. The three-tier body (air inlet, air outlet and reservoir base) is CNC machined from billet aluminum and black anodized, with the Alpha logo cut into the top.

Features

• Three-tier design separates oil from crankcase vapor before it reaches the intake
• Oil drains back to the oil pan through a check valve, so there is no can to empty
• CNC-machined billet aluminum body, black anodized for corrosion resistance
• AN fittings and high-quality seals
• Uses the factory ports for plumbing, so no drilling is needed on a standard setup
• Works alongside the Alpha GT-R fuel cooler

What Is Included

• Alpha billet air/oil separator
• Mounting bracket and stainless M6 hardware
• Replacement Alpha dipstick tube with drain-back fitting
• -6AN drain hose
• Four -8AN vent hoses, made long so they can be cut to suit your intake
• Spare bungs, grommets and plugs for custom intake pipes

Specs

Installation

AMS's installation instructions (PDF) cover each step: release the serpentine belt tension and remove two idler pulleys, swap the factory dipstick tube for the Alpha tube, mount the bracket to the timing cover, then run the drain line and the four vent hoses to the valve covers and intake tubes. Check every hose for kinks and safe routing before the final tightening.

FAQ

Does it fit the GT-R Nismo?
Yes, but 2015 and later Nismo models also need the AMS Alpha Coolant Expansion Tank for the separator to fit.

Do I have to empty it?
No. Collected oil drains back into the oil pan through the check valve.

Is it worth it on a stock GT-R?
Yes. The factory PCV setup lets oil film build up in the intake tract even on stock cars, and the problem gets worse as boost goes up.

Does it work with aftermarket intakes?
Yes. The vent hoses are supplied long so they can be cut to length, and spare bungs and grommets are included for intake pipes that need a new port.

Fitment Notes

Fits every US Nissan GT-R R35 from 2009 to 2024. The 2015-2024 GT-R Nismo also needs the AMS coolant expansion tank. Browse all AMS Performance parts.

Questions about fitment? Call (310) 231-0292 or text (310) 886-3111.