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hi all how can i determine what is the problem when oil is coming out and fill the oil catch tank? this happens only when the motor is on boost level.
without boost pressure, never does it

regards

could be your PCV valve is bad or it could be the rings in the motor

i have eliminated the pcv valve and put the pipe in the oil catch tank.
i have made also a compression test and found all the cylinders about 13 bar pressure

well there is a pressurized something leading to your valve cover or somewhere on the motor. if you have 191psi (13bar) cylinder pressure.

2 gen cars have catch cans that drain back to the oil pan. How can it
fill up?

Or do you mean a second catch can?

_________________
05 wrx wagon
99 Benz ML 320
91 eagle summit swapped - 6/4 bolt combo
94 Audi s4 - sold
88 Eagle Vista Turbo LX sedan, RIP

my mechanic ld me that it is a piston problem
i will dismantle the engine soon