add up all the prices for parts......
and see how much you would save on labour by doing it yourself.i know your new to mb's and maybe you could do all of this and be enviromentally resposible as well but there will come a time that you'll need him(this is a great forum but it can't solve everything) and if your not saving alot in labour(your definition of alot) then this first visit could go a long way in cultivating a rewarding relationship and you know it'll be done properly.if you do let him do it,try to watch as much as you can.this is ,of course, IMHO--i've always wanted to use that!
'95 s500 (bought for wife but can't bear to share!!!) 125kms
'92 legend 180kms
'88 tbirdturbo(fantastic car-only regular maint.)120kms
'87 mustang gt(gone)
'85 mustang gt(gone-but not forgotten)