I hate to be the messenger, but you have bent valves on the left bank. You can do a compression check starting with the left bank, but you can also pull the left bank valve cover and check for loose rockers. At that mileage I would recommend a complete valve job rather than just doing one side. In 30 years I have never seen an MB V8 with a piece of the inner left bank rail stuck in the chain that didn't have bent valves.
