Hmmm, the car was sitting for over a year (although it did start right up with a recharged battery). I will first verify the fluid levels as suggested, and (if they're OK), I'll try starting in 1st gear.

Also, to answer leathermang's questions, the car has about 220K miles, and as far as I know, is original. I bought the car 3 years ago with the intent of making it somewhat of a daily driver (as I've always loved 123s) but got side tracked with a house restoration. Now that the house is more or less done, it's time to refocus on the car...

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1983 240D Euro 4 speed
2004 C230 Kompressor
2006 BMW X3