I did have an oil leak I was going thru 200 mls every two weeks then I had the timing belt done and that’s when we found the leak,( lefthand front of engine something called cam belt thingy)and rocker covers. No leaking or use of coolant and only black smoke from exhaust.I think there’s a vacuum pressure problem that maybe the mechanic hasn’t tightened a hose up properly.
But I’m no mechanic.