The two major issues around the RB30 relate to your oiling system and crank collar. This isn’t distinct to only the RB30 collection, given that the RB20/twenty five/26 even have noted concerns Together with the oil pump and oiling units. They all are afflicted by this problem (early RB26 only). https://troyllkig.iyublog.com/27889751/nissan-rb26-engine-an-overview