Hi all; One of the first things I was taught when I was a snot apprentice years ago was that different metals do not like each other. What does Volvo do - (I guess others too) is put these fancy mag wheel on the forged steel wheel carrying assemblies. Yup - the Mag corrodes and it took a long piece of scaffolding to prize off the wide mag wheel. No way in hell would I have got that off on the road side. Will now go round the rest cleaning and greasing the centre location colars. Regards Ian