All engines,all cranks have degrees of whip...must have as the 'firing order' dictates the loads will never be 'opposite & even' on an engine......its the degree of crank whip that can cause a problem.I dont think the 2.5,now only produced in Ford of Europe, would have had a DMD fitted 'as standard' if there was no problem...Ford dont spend on parts just for the sake of it!