Welcome! You've got a great car; take care of it and it will spoil you.

A few things I'd check and do:
Get an oil change first chance you get. Make sure they treat your accelerator linkage with care.
Verify that the air cleaner element is not too dirty - replace if necessary. Also, that all ducting to the turbo is clear and tight.
Top off all fluids to proper levels - brake, power steering, auto trans.
Check tires for uneven wear.
Check brakes for rotor and pad condition.

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Codifex
1981 240D ChinaBlue (Got her running with a donor engine.)
1983 300DTurbo w/sunroof.
1984 300TD manual sunroof. (Electrical Gremlins)