Review on URO Parts 42mm P/S Reservoir Cap 🔍 Seal with 2mm Cross Section - Enhanced SEO by Daron Ellis

Don't forget to remove the old O-ring from the lid beforehand. Maybe it is, but it's torn so badly that it seems this is one of the threads. Use the tip of a sharp knife or a small screwdriver to pry it off. It fits perfectly. My 328xi station wagon is happy. Fill up the tank and you're done.