Mercedes-Benz is now recommending that all FSS-equipped vehicles leave the oil drainplug off and install their Mannheim total-loss oiling system, which apparently is a gravity-feed cannister mounted in place of of the oil filler cap. This revolutionary system ensures a fresh supply of engine lubricants while eliminating sludge build-up as you drive. I understand their experience with diesel automobiles led them to believe this system would be socially acceptable to other motorists.
"Lead, follow, or better yet, get out of the way!"E500 owners motto