MB are more costly than other cars in some cases, but they were never supposed to be cheap to own. Most of these cars were made for people with money, who wouldn't bat an eye at dropping $1k to fix a seat or $2k to fix a cracked cylinder head. An S class was not built so the average guy could afford it. You could make a case for the C and E class, but there still expensive complex cars.

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