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This is offtopic, but did you put the intake spacer as one of your top LFX mods? I got one from jacfab when he first made them, but I never got to test it out. How is it? Butt dyno approved?
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I can't say if I would put it in my top 3 mods. While it did make the exhaust and idle louder, I installed it too soon after upgrading to hi-flo cats, so I have no idea if it made any noticeable difference in torque.
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Well since the OEM one, does install on the clean side, and not the dirty side, how have you concluded that it does not collect oil at WOT and/or @ high G turns?
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While this is my experience with the V6 LFX engine, I am sure that GM took shortcuts with designs on the other Camaro engines also. I am pretty sure that this same scenario is how the excess oil found it's way into the OP's intake.
The OEM trap on the LFX engine is a bulge in the driver's side hose that connects between the intake and the PCV inlet on the rear of the engine. I have never raced my car, and only do WOT pulls occasionally. If I hadn't been modding and evaluating things in the intake area, I may have never noticed this problem. After I installed my CAI, I then installed the race scoop, my custom wash bottle, and black hose clamps over several months. Each of these required the removal of the intake piping between the filter and the throttle body.
I started to notice an oily film in the CAI intake pipe, and traced it to the clean side PCV connection in the CAI tubing. Since it has been proven that the air flow can reverse at WOT and flow from the engine connection on the clean side into the intake (as well as on the dirty side at the same time), this meant that the OEM trap was not stopping the oil fumes coming from that area. Since there is no way to drain the oil that the clean-side trap catches, it must have been saturated and allowing the fumes to pass it. They were condensing back into oil droplets before they got to the CAI. This is one of the reasons why GM puts an oil trap well behind the throttle body on the LFX engine.
This oil problem didn't happen immediately, but it did happen eventually. If I had been racing my car, the build-up of oil in the intake could have been much higher, and have easily flowed back into the filter during high G turns. On a V8 engine, there is that much more flow through the PCV system, and more oil vapor to contend with.
I installed a second smaller catch can to be able to drain this excess PCV contaminated oil from the clean-side line before it could make it into my intake. Others have installed the Apex or the new 1LE clean-side separator to essentially do the same thing.