Look up " outboard making oil " it is a very common problem with 4 strokes. Especially if you break them in how they want you to. The rings never seat. That is why this happens. You have to break them in like you stole it and Don't care. Wide open from the first start.
My powered was replaced 2x because I listened to them. The last one it was broken in by wide open from the start. Did not make oil that time. The first 2 years the dealer had it 1.5 years in total. After that it has not been back since.