To Punto Specialists / Oil Consumption 176

I have read something here, but can’t find any similar posts. My Punto 1.2 60 Bj 96 needs a lot of oil. Guess about 1l on 1000km if not more. Of course he does a little sweating, but not so engrave that he loses 1l to the outside. So he doesn’t normally run a blue cloud from the exhaust and also no round motor run quite the opposite. Only where should the oil go? Is it normal? It only remains oil outside (visible) or in the combustion The cooling water also seems to me normal and the engine does not get hot. To the info drive 10w40 maybe I should switch to 15W40? Thicker oil should be better with older engines or? LG