It depends how deep your pockets are. The fact the car has had 6 owners is a "red flag". I would interpret that to mean that one owner after the other realized the car is a money pit and sold it. Meaning also that the car was never maintained properly and you will be footing the bill to make the car right now. Since the engine doesn't run it will be difficult to assess the actual condition of this 1995 S420, other than the cleanliness of the engine compartment and the interior, plus the quality of the paint and presence of any rust. It would be preferable to get the car on a lift so you can check the condition of the rubber suspension components, etc.

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Fred Hoelzle