Hello! For a while I have had to refill all 1.000km about 1/2 l oil. I know this is not very much, but before (up to approx. 250,000km) I had to refill nothing between the oil changes. Since the oil does not penetrate outwards through def. gaskets, it can only get through the valve shaft seals or piston rings into the cylinders. The oil used has the viscosity 10W-40. Question: Does it bring something if I use thicker 15W-40 oil? Or does someone know another cause or lösu ng to reduce consumption? I am grateful for any hint…!