Скачать или смотреть WRX Hybrid Oil Cap Blow-By Test

Trying to diagnose white smoke and liquid build up at my tailpipe after idling for awhile. Pretty sure it's coolant, but not sure if it's the turbo, a head gasket, or some other engine issue (broken ringlands? something?).

The engine is a EJ257 short block with heads from an EJ205 longblock (2002 WRX). Stock turbo with about 227k on it.

While the car is hot, if I take off the oil cap, there isn't any smoke, even when I rev the engine. Makes me think that it's not a ring land or some other piston issue, but not sure how much puff puff i'm supposed to be getting out of the oil filler tube. There is quite a bit of "mechanical" sound comign through the filler tube; not sure if this normal.

Advice/thoughts appreciated!