I was able to replace my #6 glow plug a few months back without a problem. It was a pain in the ass but nothing went wrong. Well now another glow plug has gone bad and frankly I would rather spend time working on my W111 than my daily driver. Should I spend the 4.5 hours at $85 for the dealer to do the work? I have much more time than money, but my time could be spent more wisely in my opinion. There is also Frank's service, whom I feel is one of the most knowledgable men, who could perform the service. He might not be as fast as the dealership and I really don't want to wait forever to get my daily driver back. He specializes in Mercedes and owns a flawless 1955 300SL convertible among many other cars. He has always been more than helpful when answering any questions I may have and it would be nice to throw him some business.

This is more a matter of opinion than a technical question, but I know you guys would be able to help.