W140 Injectors Leak
I have a W140 with M104 engine.
I have a, what I suspect, a injector leak as the #5 injector have black oil all around the outside (just by looking) while all others are just dust.
I will properly get a mechanics to replace the injectors as its a 1992 car. However I read that there are other plastic, housing, hose, vacum that should be replaced as well.
Can someone explain what I need to tell the mechanic to replace?
Any idea of cost?