Failure of bearings and rods from contamination and/or oil flow issues are generally as a result of failure to replace an oil cooler from a previous engine failure, inadequate oil amount, missing oil gallery plugs, worn oil pump and blocked oil galleries. Incorrectly torqued fasteners will generally cause failure within the first few thousand kilometres/miles and failure as a result of engine over speeding typically shears both rod bolts off flush the machined or fractured connecting rod joint.