Book says 1.9 litres of MTF needed for a change or 2.1 litres "total" Can I take it that on a change they don't expect to get every drop of oil out so circa 0.2 of a litre is left in the box even after youve drained it ? Given that its about £14 a bottle for the genuine stuff i don't really want to have to buy a third bottle for just 0.1 litres of fluid if i rely on the "total" figure. What are other people's experiences? Also is it just a 3/8 square drive i need to undo the drain plug ? No special tool as such ?