These indicators are broken…..

Hello, I’ve been driving an MB E220 T CDI BJ 99 or 2000 for 2 years. At my last KD (ATU) I’ve been pointed out to leaky injectors and I’m supposed to have this fixed with MB – what I wanted to do today too (at ATU the necessary tool is not available) During the preliminary interview the MB Master said that an exchange of injectors with a probability of 70% to 30% will not be necessary, so his experience would be worth. But after the review almost hit me. The statement of MB: all injectors are totally fixed (or destroyed – or as always you say, I forgot to be afraid) all 4 have to be replaced and that costs times so sluggish 2.500 €. I first picked up my vehicle again and would like to get some opinions about it. The car is also totally rusty – so that I don’t think a repair is worth it anymore – even though it’s only 180.000km and still an inheritance from my father is! My question – can be asked – thank you for the same thing?