Try a different (better) brand of oil.
When I used Quaker state I would be down a litre when the next change was due (5K km)... when I tried Castrol, it stayed full. Needless to say I haven't used "Q" since!! It wouldn't burn it (as far as I could tell)... I thought maybe it was just evaporating some component out of the oil (??).
BTW, most cheapie oil change places around here use Quaker state unless you tell them to use a different brand (then they charge you more).
Brent
