25l
must of cost a bit
Im currently working my way through 4x 5 liter bottles of the cheap stuff from lidl, cant remember the make but think its 15/40.
Interestingly I used to lose quite a bit of oil from what i suspect is the valve guildes on 1 cyclinder but that has reduced/compleatly stopped recently (although my fuel efficiency has also plumeted to exactly 25mpg for the last 3 fill ups...)