Thought i should revisit this topic haha.
The RB30 has been running faultlessly now for almost 2 years. It did 1 year on 300kw and now almost 9 months on 340kw. That includes 5-6 drift days in which the car gets driven very very hard (sitting on 7000rpm limiter in 4th gear). All i have done to it maintenance wise is to keep doing regular oil changes haha, now settled on using Penrite full syn 15-W50 10 tenths racing. When i first got the RB30 it had 330,000km on it, and i have done another 10-15,000 in those 2 years. So for a completely stock non turbo RB30 bottom end running more than triple the factory power level it is doing pretty fin good!