I think KB has done a good job of addressing pressure spikes ( top ring flutter ) with their "accumulator groove" ( between the top and second rings ) design on their Hypo pistons. Remember any oil that gets in to the combustion chamber ( via the rings or the valve guides )can have very negative affects on the octane number ( reads detonation ). Those of you that run on the edge for pump gas, this can mean broken parts. Oil in the mix can have much more serious affects than getting the quench right.