I am a mechanic But have never worked on anything mercedes And my moms bf has a older one that needs new piston rings

Just curious if its pretty much straight forward or will i need specialty tools and such
its a older around 85-90 not sure havent seen it yet

Just curious if i even wanna try and helpp them out

 

Since when is 85-90 older? Jinkies. That's practically brand new!