Topped it up, and bosh, power back to normal.
Today, went to do a tip run, low power again. Damn. So pootled it over and got what I think was a backfire, although I didn't feel anything through the seat/steering/chassis. No rattling or grinding or owt. Pulled in at the tip, checked engine bay - looks fine. No smoke, nothing obviously missing.
It seems to rev fine from idle without load, but I'm wary of chasing it through the redline if the VCT ain't kicking in and possibly misfuelling it.
Any suggestions on where to start? I'm giving it half an hour to let the oil settle to see if it's low again; if it is, I've got a *major* oil usage problem. If not, then I've got a *major* other problem I suspect
![:(](http://www.pumapeople.com/forum/public/style_emoticons/default/sad.gif)