yeap, everyone so far is spot on, my motor when i brought it was running 20psi with N1 steel wheel turbos, i drove it on the street for 12months, (its my second car so i dont drive it much) and did one trackday. When i took it to the dyno for Jez to tune, once tail pipe A/F and the A/F guage was put in before the cat, they wouldnt even ramp it up under full load on the dyno, it was too lean.... we didnt even do one run they started adding fuel straight away.... so who no's what A/F ratio it was running and what they did with the tune before i brought it, the night we were tuning was only 20deg too so the engine was nice all cool, compared to the 35deg day i did my trackday at eastern creek, my oil temps where up around 125-130deg and my water temp got to 100deg when i was pulling off the track.... she was deff running hot!
The engine now has been tuned twice, and comp test came in at 150 across the lot, and that was a cold engine. shes a solid 311rwkw on only 18psi. and has lasted 1 night at the drags and a trackday at mdtc, and a far bit of street thrashing, so far, so good, i call it a freak as most rb's would have spun a bearing or shit em selfs in some sorter way. I always run good oils in my enigne (redline) and its changed before and after each and every trackday, i also make sure i do a warm up lap, and a cool down lap if the temps are starting to build. Oh and dont forget the 1L overfill if u plan to use the stock sump.
If its a healthy engine and you look after it, with quality stuff, it will last.... 25psi is a diffrent story but....