Anyone have an idea of what might be leaking oil (other than everything )? Engine still is running great (and stock turbo is still chugging along @ 216k miles w/ stock-catted-uppipe ), and I'm diligent about keeping oil level topped off (usually needs a quart every 500-1k miles), but this car is finally no longer going to be my DD so I'll have the time to do repairs that I previously would've had to pay a mechanic for due to needing the work done fast. 2nd timing belt is also almost due, which might be a good time to tackle some leaks, depending on their cause. Also trying to get a feel for how serious this could be before spending too much time/money on other maintenance/fixes.
Some things one mechanic mentioned as possibilities a while ago were the oil cooler, head gaskets () or valve cover gaskets. One thing I've already checked is that there is blow back from the oil filler as well as suction from the oil filler when covered w/ my hand while the engine is running w/ the oil fill cap off. I believe this rules out a PCV system issue. Would a compression and/or leakdown test be recommended prior to making any assumptions of the cause?
Anyway, here's an album w/ some pics that I took while changing spark plugs a few months ago: https://imgur.com/a/pFCtl15
As well as a few of the more revealing pics...
Can see some fresh wetting from the front drivers side plug area with the coil pack removed:
From below:
Cooler/filter:
Full view of the pan: