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[Engine] Timing Belt Squealing
If the compression is good & you're losing oil at 200k KM it's likely to be either wear on the valve stem oil seals ( I assume this motor has valve stem oil seals) or the valve stems / guides.
Sounds like a head off job especially if the valve gear is held in place by the head bolts, the only extra thing you'd need would be a head gasket which would probably best be replaced anyway if you're taking the head bolts out.
Once the head is off you have full access to the valves and you can check the wear on stems & guides in addition to replacing the seals.
Thanks for all the input guys.
Car still with mechanic.
Just a wild thought, is it at all possible for the air cleaner to be blocked / or partially, and it to draw more heavily on the breather and suck lots of oil from the rocker cover? Is there a pcv valve in the breather?
Just a thought, I can disconnect the air filter and see quickly if there is lots of oil in there.
No, but a strong overpressure could push some oil through the breather tube.

I'd suspect a partially-blocked exhaust and heavy carbon build-ups as the reason for the too-high compression.

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