The two significant challenges to the RB30 relate for the oiling system and crank collar. This isn’t precise to simply the RB30 series, as being the RB20/twenty five/26 even have noted problems While using the oil pump and oiling programs. All of them put up with this challenge (early RB26 https://sergiozscef.theblogfairy.com/27895669/r33-rb26dett-engine-for-sale-can-be-fun-for-anyone