So, I have had an issue with burning oil (1L between oil changes) for a solid 3-4 months now. I put it to the valve seal guides. Never had anything checked out. Last month, my gas consumption cruised on up within a tank going from 600kms a tank to 400. Shortly after I began to be able to smell oil burning.. Mostly out of the turbo area. Now just last week, this smell changed to nearly that of burning rubber. So my question is this, could this be an issue with the turbo (as I checked the turbo for issues i found oil in the compression/up-pipe side) or is this an engine issue?