To me there is a lot to take in on a deal like this. Vehicle model aside what's the maintenance history for example. These R class are still an x164 platform which it shares with the GL, ML so there is nothing particularly worse on the R model than the others. The OM642 is decent, assuming great maintenance at this mileage.

I would be worried with light rust from Pennsylvania. If you scooped this up for 3,000.00 how could you go wrong even if you only got a couple of years outa it?

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1995 E300 (W124)
1999 ML430 (w163)
2011 GL350 (x164)
2016 Sprinter 144" 4X4 lowtop (906)
2004 E500 (W211) 4matic Wagon (Gold)
2004 E500 (W211) 4matic Wagon Avantgarde (silver)