I just got back from my trusted MB dealer where the service tech warned me that my after-market metal valve stem caps were corroding the valve stems and TPMS sensors.

Basically, he said a couple of bucks at Wal-Mart for plastic caps will save me $200 per tire!

The previous owner of my CF put those metal ones on. I had no idea they weren't stock.

It also goes to show me that my MB dealership is looking out for me.

As a side note, MB also changed the oil grade from 0W-40 as well, not just Chrysler.