Recommended Engine oil for 2002 Mercedes a140?

Any major brand is good. Use the exact weight as recommended in your owner's manual. I would guess that would be 5w20. Look and see or call a Mercedes dealer to be sure. The recommended type is Mobil 1 0W/40W fully synthetic - MB have been using that on mine for the past 7 years. It might vary slightly but fully synthetic is best and Mobil 1 is endorsed by MB.