My oil fill cap is weeping a little oil. Stock BMW o-rings are $4.21 apiece, part number 07-11-9-904-950: https://shop.maxbmw.com/fiche/DiagramsMain.aspx?vid=60124&rnd=09082020 .
At $6.81 for 25 o-rings (27 cents apiece) I am going to try these from McMaster Carr: https://www.mcmaster.com/products/o...t~metric/width~3-530mm/width~3-500mm/od~32mm/ . Had to pay shipping plus tax, total came to $17.15, but that is only 68 cents per o-ring. I specifically chose 3.5 mm thick (diameter) o-rings, maybe get a better seal. Will report on results.
At $6.81 for 25 o-rings (27 cents apiece) I am going to try these from McMaster Carr: https://www.mcmaster.com/products/o...t~metric/width~3-530mm/width~3-500mm/od~32mm/ . Had to pay shipping plus tax, total came to $17.15, but that is only 68 cents per o-ring. I specifically chose 3.5 mm thick (diameter) o-rings, maybe get a better seal. Will report on results.