for what its worth - last change i let my rb25det drain for an hour - was barely dripping (1 drip from the drain hole evey 20-30 seconds) took the used oil bucket away - chucked another bucket underneath and left it for another 8 hours (went to sleep)checked the bucket in the morning, i was amazed, there was a considerable amount of oil that had still drained into the bucket.. at a guess id say 250ml .. its a bit overkill for 250ml or so..