[boxermania]

Yep....being a flat or pancake engine there is a potential for oil to get into the cylinder, unlike V engines whose cylinders are on the vertical and have gravity working against it, once in the cylinder the oil will be "scrapped" by the oil ring.

If the oil ring gaps are at the bottom, some of that oil will find it's way past the ring gaps, eventually finding it's way to the combustion chamber........