I have watched for awhile other people stashes on here unsure whether to post mine. I'll put my flame suit on and wait for the bashing. We have 6 cars and various off road vehicles to maintain. I do occasionally change a neighbour's or friend that is not as well off. The cars all take between 6.5 and 9 litres of oil per change. I change at between 5000 and 7000 km each. Although when we buy a new ( used) car I always do a couple short OCI. We drive A LOT. At my highest I was at approximately 830 litres, I am now down to 700 or so. I always buy on sale and the valvoline, Castrol and some of the Mobil 1 ( 5w30) I purchased at $13 per jug which is considerably less than the $55 they usually go for.