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Originally Posted by running-snail
I'm looking at purchasing a 300sd for my daughter (maybe she'll refuse to drive it  ). What am I looking at concerning parts costs and ease of DIY when compared to a 123? Availability of parts a problem?
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The parts cost of the 126 (pre '86) versus all W123 is nearly identical. The W126 has a few extra features such as power seats and outside temperature display, but, effectively, the maintainance costs will be just about identical.
The larger W126 can be easier to work underneath the hood because of the additional space.