They are pretty simple to work on. The S320 at least is very similer to my SDL. A lot of the parts like the serp belt system, ps pump, oil filter are similer or in the same spot. The learning curve is very easy for the M104 I6 at least.

I'd buy a scanner if I owned one, because when eletrical stuff breaks thats really the best way to find the problem. Either that or throw parts at it.

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2006 CL500
2009 C300 4matic
1969 280SE
2023 Ram 1500
2007 Tiara 3200