someone said that a RB25DET engine can take around 300kw of power to punish it for around 10 months (from someones record of it being boosted) So I'm guessing if you take down a few tens of kw of power and say run it at 240kw like im planning before I need a rebuild, you'll have it running for around 70,000kms im predicting after I've past 128,000kms of it never being boosted in the past to the best of my knowledge and it having been serviced regularily in japan (i have all japanese papers, log books, manuals, service certificates and stamps and records etc etc etc everything, kinda rare I heard).