I have this cap on my 328, and it's leaking/failed. Does anyone know what I can grab at the local parts store? Image Unavailable, Please Login
The Stant 10331 coolant tank cap might be available to you locally. We have them at Ricambi America too: https://www.ricambiamerica.com/137644a-expansion-tank-cap-radiator.html
Check this thread: The 308/328 Coolant System – Anatomy of the Expansion Tank Cap The conclusion from it is that the Stant 10320 is the correct cap: not the 10331 (or 10321).
A very well respected member of this site and very highly regarded mechanic recently replaced mine with a Stant 10231. I'm not so sure 10320 is "correct".
The linked thread is more than I care to read this morning. I'll stick with what Rifledriver installed for me.