Towards the end before I pulled the engine out for rebuild, I used to have to top mine up everytime I went out in it!!
don't know how many miles that was as I never paid any attention as to how many miles I did, but I used to use it about 4 or 5 times a week.
Got to the point I was just shoving £14 for 5 litres Valvoline stuff in it! Fuck using the expensive gear!! Engine was worn anyway so I could get away with it!!