Almost thrown off

Very close call today.

Pulled out of drive way and thank god this happed as I tootled down the road, my bike suddenly came to an abrupt deceleration and threw me into the tank very hard.

I pulled over and upon careful inspection the oil level was very low - I missed the oil light like an idiot!!

I have no oil leeks anywhere and it was serviced 3 months ago, what could have caused this radical loss of oil happen in such a short space of time?

I'm guessing this is not good news and something serious is on the way out!.

background - S4 02, modified exhaust more or less open pipe, 996 ST engine in there to replace the 916 which has done 12k. Belts are due now.

cheers folks