I had an oily rear hatch issue which was caused by the o-ring where the dipstick tube enters the block. It was leaking under load, causing a sort of mist due to crankcase pressure. It was hard to see the source, and it would coat the back of my car in oil in a fairly short amount of time.
Based on my experience, I would think oil leaking from your engine is a plausible cause of your issue, or at least worth investigating further
I always tend to think the worst. Especially when I do things myself. I took a peek under the car. I ran it for probably 10 minutes, idling, with me under it and no obvious drips occured, but it is definitely wet. Super wet. Like everything is leaking. Looks like it might be time for a reseal. Including a HG.
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Notice I wiped below the valve cover abut a week ago. It doesn't look like there is fresh oil until it gets to the point where the head meets the block.
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Then, it does look oily around cylinder 4 spark plug hole. Cylinderso 2 & 3 spark plug holes are not wet. Number 1 is because of the oil filler cap.
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Everything is so wet. Drips of oil on places that I wouldn't even think oil could get to.
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There was hanging in the steel braided drain hose where it connects to the AN fitting and on one of the oil cooler lines, which I wiped off previous to taking the picture. It did seem to have a slight ring of oil around around the yoshi fitting in the block, but that's probably from above.
There are oil drips on the clamp that holds the hot side of the turbo to the chra and on the waste gate arm. Wtf. There are new copper crush rings in the inlet and the top of the chra is dry.
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I held a white piece of printer paper behind my open downpipe for a couple minutes with it idling. It's definitely not blowing oil out the exhaust, at idle anyways. I'd bet it's not under load either.