I always thought that one of the side benefits of a properly working EGR system was cooler cylinder temperatures.

When I bought the first VX, the Isuzu tech(s) told me to immediately change the oil with Mobil 1 0W-30. Maybe this was to combat the oil drainage issue right off the bat.

Wait a minute...
3 piston rings, top to bottom
Compression
Compression
Oil Control/scraper

Crank case

Why exactly does oil need to drain through a hole in the piston/ring land in order for it to be returned to the crank case -shouldn't it drain down there on it's own with every downstroke of the piston?