I am not familiar with Mercedes diesels but have been driving my Dodge Cummings for over 170,000 miles and worked in a garage and did serviced a lot of diesel trucks in the mid 80's.

The Mercedes I'm looking at has 180,00 miles

Considering possible injectors. Would nozzles fix it or would injectors be needed. Replacing injectors with rebuilt at $51 ea ($204 / set of 4 )would that be the worst case?

Thank You