jamm220

I meant to post this a while back, but forgot. While working on my E39 540 this weekend I needed a oring for the lower radiator hose and didn't want order from BMP and wait a few days. I went to Audi, replace the oring and back on the road again. If your radiator hose is leaking at the quick disconnect chances are its the oring. The part number is 4E0121666. measurements are 38mm/4mm. Its up to you whether or not you want to replace the hose of the oring. The price was $7 for two still a lil high but a huge saving compare to the replacing the hose.