so far favorable results, Well is it your first observation of oil reduction or already noticed couple of times? if its first time then try another good shop with same oil grade 5w30.
May you are a victim and the counterfeit product haven't damaged a lot.
Hope for the best.
Just on a cold start check if the air bubbles appear in water inside radiator on startup or after 1 minute.
All mira es for stance of 30 secs on a cold start do give a slight whitish smoke and then disappear.
in last, once car is at optimal temperature give a hard accelerator as its RPM won't REV high but check any smoke color visible or ask some one to follow you while you accelerate HARD every gear from 0 to at least 90~95 to see the emitting of white smoke.