Who has experience with the Mercedes 2.5 TD engine (from the 90s)?

Hello,
I also have a Mercedes C-Class from 1998 with the 2.5TD engine (110kW).
I once read somewhere that you can also do '10-cent tuning' here.
I can apply it, but unfortunately, I can't find the article anymore .
Who can help me?!?

Hi, please read the technical article about the 10-cent tuning, and you'll quickly see if and how it works.