The point is, you go as far as you personally feel comfortable with, which is what Robin is saying..
You cannot assign a figure to the breaking point of a motor, its really not that simple, its not just 350hp its ok.. 351 and its going to sh*t itself.. There are so so many different factors.. Which brings me back to my point that you could easily throw a rod at 200hp all it takes is excessive heat, a bearing to nip up in the bottom end and see ya later..
the general consensus is that having your car serviced every 10-12k is thr way to go, unless you are making some ridiculous power like jonnyC where you could half that to 5-6k intervals
I do mine every 3-4k, but thats very much on the safe side.. For the cost of a filter and 5 litres of oil and 30 mins effort its VERY much worth it in my eyes.. That goes for any car!
safe as houses, get some water meth as well, lower inlet temps, so less detonation so less heat, with the by product of more power as well.
As jonny says the only way past 280hp on a k03 is with water methanol.
Lets not get back into the K03 making 300hp with a standard intake argument.. But seriously.. Its NEVER going to happen without W/M and every single supporting mod to allow you to run gobs of boost low down, and lots of ignition advance top end..
Anyways Bacillus, are you going to make it to Pod? Then you can shut us all up with a mid 13 second run..