I have also been thinking about this with oil splash in the rear cylinders . when i downshift from fourth to third and give wot, i get detonation from what i believe is excessive oil . So you say oil also gets trapped on the "wrong" side of the W.tray. Hmm...of course. I have been looking for scrapers , not found any . I have just dropped the pan to baffle it , guess there is more to look at .