I have to agree with Larry, nothing is more important that condition. that being said and all things being equal, I would prefer an 84, or 85. There is more than enough tinkering involved with owning these to satify, you don't need one that is a mechanics special or a bodymans nightmare. That will tend to discourage you and put a bad taste in your mouth for MB. Spend the money, get something in nice shape first,and get your feet wet slowly before looking at "needs work".

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81 Mercedes 300SD 289k.......SOLD
82 Mercedes 300CD 252k......slow ride

82 mercedes 300 SD...mi Unknown
83 Mercedes 300D ????ksniff..gone too
84 Mercedes 300D 148k........SOLD
85 Mercedes 300TD 386k and holding some one elses project