Ok, did some hill runs, a trail of blue smoke is visible under really heavy acceleration.

So that condemns the rings to letting oil into the chamber but how much exactly is my question.

I find it surprising this much oil can go into the chamber and the car still run...

 

The old adage says, blue smoke when going up, rings, blue smoke when going down, valve guides.

 

That's a fair conclusion.

Time to scrap the engine I guess, without a definite answer where a liter of oil is going every 100 kms.

 

Update on the situation.

Noticed a huge oil leak coming from the central part of the engine.
I can only reproduced it after a long drive, when parking and moving back and forth.

a spot of oil the size of a CD suddenly comes out.

 

It would be good to pinpoint where it's coming from.

 

Oil filter and oil pressure switch are on back side of engine. Oil Pressure Switch is a known leak source. Can be a large leak.

Valve cover can leak to back side of engine but trail from cover downward should be obvious.

good luck

 

Leaks are one thing, but their causes are different.

I've noticed some steam from the dipstick and valve cover breather.

It could be excessive blowby pushing oil past seals no?

 

Another common thing is a bad PCV valve allowing the crankcase to pressurize.

 

take the oil cap off, and gun the motor. If there is oil shooting out your rings are toast.

 

Car is sold.

Thread can be closed. Thanks guys!