There exists a typical oiling problem With all the pre-1992 R32 RB26 motors, given that the area the place the crankshaft satisfies the oil pump was machined too tiny, at some point resulting in oil pump failure at higher rpm. This difficulty was fixed in afterwards variations from the RB26 https://arthurhtpad.azzablog.com/31302263/considerations-to-know-about-nissan-skyline-rb26-engine