Should one have the heads planned directly when changing the ZKD’s? Have asked today in different companies….Audi doesn’t do it when “need”……some only do it with plan, otherwise they don’t take any guarantee……others do it on request……some said it’s only necessary in rare cases. Financially, planning out almost 1/3 of the wages, therefore the question, what is really true now. Better it will certainly be, only if necessary? David