MBZ did a 'fantastic' job using CAD to design this multi-surface joint--beautifully precise on paper. Unfortunately, when you have gaskets that must seal across multiple surfaces--it becomes extremely difficult to remove any one of those surfaces and replace it without some kind of damage. Hell--it is IMPOSSIBLE to keep this joint on the V-12's from leaking with all new gaskets, much less removing one part and reinstalling.


I think it is unfair to ask the mechanic to do the head gasket replacement free. That probability is inherent in that work. Sometimes you can clean the joint well and use the MBZ special sealant with good results.Sometimes it leaks. I would not pull the head--I would clean carefully, completely, lastly with rubbing alcohol, and use the MBZ part # stuff specifically called for and not worry.