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Verus air/oil separator

Verus air/oil separator

Regular price $389.00 USD
Regular price Sale price $389.00 USD
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Direct injection engines can suffer from deposits on the backside of the intake valves. On older engines, these were washed off by the fuel spray - but not anymore. This is particularly a problem with boosted engines as they tend to have more oil vapor in the crankcase. The stock PCV system burns this off by feeding it into the intake air, which increases the buildup on the intake valves. To make matters worse, the usual gas additives that clean off your valves don't work because the fuel is injected directly into the cylinder, bypassing the valves.

We worked with Verus Engineering to test their newest air/oil separator (or "catch can"). This device supplements the stock PCV setup. It collects the air from both the crankcase and the head. It's then run through a separate 5 micron coalescent filter for each source, then the air passes through a series of baffles and stainless mesh. All of these parts - including the filters - are intended to help the oil come out of suspension and separate from the air (hence the name). Since the filters don't hold anything back, they don't need to be cleaned or replaced. Two more 5 micron coalescent filters give the air one final scrub before it heads for the intake manifold and intake piping. The extracted oil is captured by the separator and can be easily drained with a turn of the drain valve. This allows you to monitor the level of oil vapor in the engine, which is an indicator of engine health. It also includes a forced-induction compatible PCV valve which can cope with positive intake manifold pressure.

We have tested this on track with one of our turbo NDs, and it works well. Naturally, it's made of 6061-T6 aluminum and anodized black for long life.

If your car is equipped with a sound tube, you will need a sound tube delete. Otherwise, everything you need is included.

Please note that this isn't legal for California since it doesn't drain back to the oil pan. We prefer to keep the gross things that your AOS pulls out from returning to your oil system, but if the AOS isn't drained and fills up, ugly things can happen and your emissions will increase. For this reason, we can't ship this to California (we know, but we don't make the laws). 

This is intended for LHD (left hand drive) cars. It will work on RHD cars, but be prepared for some problem solving - you may need to tweak the mounting and hose routing a bit. RHD customers tell us it's a solvable problem, but it's not something our instructions will address as we don't have any direct experience with RHD cars. 



Ships free in the US.

There are no shipping restrictions on this item.

What does it fit?

Fits: 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023, 2024


Emissions do not apply.


1 year


04-37960 2016+

Customer Reviews

Based on 7 reviews
That darn Blind hose! lol

Great kit! awesome fitment! but that one hose to the back of the block is a huge pain. I have big hands and couldnt seee what I wwass doing. So I took my bore scope camera and set it up so I could see my hand and the hose part. Oiled the hose so it could slip on and that did the trick after fussing over it for 30-40 mins. Rest of install was cake!

Keeping the intake clean on my new to me low km miata, will see what the future holds and if I will need to media blast the intakes or not later on.

Alan H.
Challenging fit to a RHD ND1 with Supercharger

Definitely a well made product that would have been a relatively straight forward fit except I have an Edelbrock supercharger which means you can't use the standard mounting position.

Ended up there was sufficient room amongst the brake lines to fit so a minor modification to the mounting bracket & hey presto!

I just had to make sure when fitting the supercharger that I extended the lines from the PVC & supercharger as it would have been impossible to fit them later.

Great product, annoying install

Overall a very well put together, high quality product. The install, while being straightforward is a bit annoying to say the least. I own a 2016 Grand Touring ND1, so for those in the same boat I will offer some advice from my experience.

1. The pcv valve nipple and intake manifold nipple are two different diameters. Bear this in mind as the hose going to the pcv went on easily, while the intake manifold one did not want to go on. What I ended up doing was taking a 1/4 inch drive 11/32 deep socket and shoving it in the end of the hose that was going to be installed on the intake manifold nipple and left it to sit for 20 minutes or so to aid in expanding it. After adding a decent drop of motor oil to the hose end and removing the socket, I quickly fished it down and lined it up popped into place with ease! Success!

2. Put a drop of oil on all the hose ends before you install them on the versus air/oil separator nipples. They were extremely stubborn for me until I tried this trick and went on smooth as butter after. I am running a naturally aspirated setup so no worries about them slipping off later.

I hope this will help anyone who is struggling to install theirs in the future.

Make sure you get the hoses in the right order!

I mixed up the intake manifold and the block pcv hoses which caused the idle to be all over the place and the temperature sensor to read high when idling for several minutes. Putting the hoses on the back of the engine was the worst part of the install. My arm still hurts from all the chaffing while trying to get the hoses on.

All around a great product and I'm quite satisfied.

alan 1.
Nice 4 position filtered AOS ( aka oil catch can ) - Patience is a plus

The design is really nice. What is not nice is trying to get your arm in position to reach the PCV valve ! I could not do it. So the ways to get at it include 1) removing the intake or 2) removing the cowl grill & stuff at the top to clear the way. I chose to remove the cowl grill / wiper arms / 2 nuts holding the hydraulic line to the fire wall / the front sway bar / the cowl weather stripping / 2 screws holding the cowl grill then separating the windshield wiper hose & pulling the cowl grills off. Then my arm could reach the PCV valve to remove that short hose to start the install. Extra time of about 2 hours but worth the effort to keep the valves clean from carbon buildup. Saw pictures of owners that took off their intakes & even at 10,000 miles there was carbon build up already !
I want this car to perform at its peak.