04 Forrester problem

[04 Forrester]

Does anyone have the Subaru specification for the amount "acceptable" oil
loss? I have had a rebuilt short block installed now for 5k (km). It
needed about 1 litre of engine oil to top up. There is no blue fog out the
tail pipe and nothing showing in the driveway as far as leaks. The motor
started out tight and quiet, but now sounds more like a diesel, but much
better with the oil topped up. It was down to the bottom hole on the stick
when checked.

thanks all.