There's a common oiling problem Using the pre-1992 R32 RB26 motors, given that the area where the crankshaft meets the oil pump was machined too modest, finally resulting in oil pump failure at substantial rpm. This situation was settled in later versions from the RB26 with a broader oil pump https://claytonhhcwi.targetblogs.com/31687768/the-basic-principles-of-nissan-rb26dett-engines-for-sale