The 2 large troubles around the RB30 relate into the oiling procedure and crank collar. This isn’t unique to only the RB30 collection, because the RB20/25/26 even have mentioned issues with the oil pump and oiling programs. All of them are afflicted with this problem (early RB26 only). Listed here https://rafaeldbaxt.bloguetechno.com/not-known-details-about-rb26-engine-sale-63716851