I always find a small amount of engine oil (maybe a few drops) on top of the stock airbox after an autocross run.

Every. Single. Time. Without. Fail. Since I got the car in 2014.

I never paid attention to it, but what could be causing this?

Even if there is a leak in my oil cap (I don't think there is), I find it highly unlikely that the oil could be traveling that far.

Could it be a bad PCV valve? I've never had my dipstick pop off though.

Never happens outside autocross but I almost never get into boost outside autocross so that may have something to do with it.

Any ideas? Car is stock.

 

In for seeing suggestions. I haven't seen anything like this before. My guess is there is some blowback happening, but on a stock airbox? A bit perplexed.

 

So just on top of the air box? No other parts/areas at all? That is weird...

 

Oddly enough I had this same thing happen when the engine was under similar conditions to an auto-x.


Turns out that when I replaced the valve cover gasket I tightened them all down in the wrong sequence and the crankcase pressure was misting oil past the gasket on the driver-side and it was collecting on the airbox.


Check that first.
-asher