You will noticed that it is not difficult for the Mercedes mechanics to work on the 603 engine, because they have the special tools to remove the various parts. Visit a friendly Mecedes shop and you will notice that besides the Snap-on tools, they also have many specialized tools. For example, it is a pain to remove some of the screws using the normal hex L wrenches. I got a set of ball head long handled metric sockets and the job is much easier. I have spent a lot of money buying certain tools for my MB - just the normal tools won't do for many jobs.