I tried one of these on my 560 SEL. It did not fit. However, a different brand may work on a different model of Benz. I used an overhead cam valve spring compression tool. Not available at the five parts store I tried, ended up buying it at a tool store (KD brand). Sorry it does not have a part number on it. The price was about $40.

My double spring valves were strong causing the tool to bend. I just kept wrapping it with duct tape to keep the feet together. I hope this helps.

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David
1988 560SEL, Green, Chrome wheels.
2000 Suburban, 20" wheels, DVD, wood grain dash (wife's car).
67 Beetle euro, Lots of Empi parts.
69 Beetle conv, 1980s cal look.