The original manual says to use the 100. Now, Mercedes dealer says the 120 is the replacement. I don't trust it, sounds like some kinda marketing shortcut...

vox_incognita, that is interesting that they are still made though, and not offered for the W123. Are you saying that fintail cap fits the later years?

BIGPAPPA55, my bottom hose sure ain't cool, when that motor is warm. I would replace therm (again), and pressure test that system right away.

Well, I went to Napa, they show a 13psi cap as a replacement. Hate to put non-German on the car, but I am sticking with the psi that is recommended in my shop manual.

__________________
Think Alternative Energy!
300CD '80 (now gone but not forgotten...)