The 2 huge challenges around the RB30 relate on the oiling procedure and crank collar. This isn’t particular to only the RB30 sequence, because the RB20/twenty five/26 even have pointed out problems with the oil pump and oiling techniques. All of them have problems with this situation (early RB26 only). https://rb26dett-engine-for-sale14814.madmouseblog.com/8718732/5-essential-elements-for-rb26dett-engine-for-sale