ask these same mechanics what they used to seal the oil/water pump assy to the block? or what are the correct timing marks for the timing and balancer belts? Or even ask them do they know how to bleed air from the cooling system?
I can bet all my money they wont know any of the above... Subaru engines are known the world over to survive any sort of running torture, except in Pakistan where "jugaroo" mechanics proceed to completely screw up the car and then blame the manufacturer that parts are too expensive.
The little 3 cyl is actually based on the suzuki G10 but has forged pistons (hence they are kept loose in the bores), the con rods are fracture split forged items and a nitrided connecting rod, the head has excellent cooling channels. Sadly all of this is "FAIL" in Pakistan where mechanic ustaad opens it up to replace piston rings and finds the pistons very free in the bores, gives it to lathe ustaad who installs new sleeves (effs up the block beyond repair)
The real problem to the oil consumption usually was worn valve seals.