It's using oil, anyone else had this problem?

[mr self destruct]

I have a similar issue with my 600, I use Yamalube semi-synth 10-40 and it does burn it away. I have to top up about every 3 weeks (750 miles) or my oil light comes on. The way I see it though, it hit 40,000 miles this week so if anything was gonna go bang it would have done by now, so I just keep topping it up.