The 2 significant complications around the RB30 relate to your oiling method and crank collar. This isn’t specific to only the RB30 collection, given that the RB20/twenty five/26 even have noted challenges Along with the oil pump and oiling programs. They all are afflicted with this situation (early RB26 only). https://nissan-skyline-rb2646665.activoblog.com/28423658/the-best-side-of-rb26dett-complete-engine