I mentioned some of the parameters of engine wear in last weeks Curvelo race thread with Dan, although it was more aimed at his temp management. There's two main factors that impact wear; temps and revs. With a 6 radiator you should've of been good for temps. It seems keeping oil under 110celsius is advisable. I couldn't see your motec or see any temps on the HUD but 6 should easy keep you at safe levels. The most likely cause is too many revs on downshifts. If any point revs are calculated to be above 8500rpm the engine will die immediately. You are rev limited to 7250rpm so you can only go above this with aggressive downshifting. You also get a wear factor of 50 for each second you are above the rev limit. If you save you replays watch your rev readout (top left) as you downshift. If it goes beyond 8500 it's an instant blowout and couldn't be avoided. If it's general wear you can adapt your driving slightly to improve engine life.