Vented Dipstick - Black - SoftailCaracteristicas: Screws into the factory oil fill spout as a stock replacement part on M Eight baggers This breathing dipstick removes unwanted build up of blow by, which is found in engines with excessive leakdown through the rings cylinders which is a common issue with large displacement big bore engines Test results show a decrease in engine sump oil levels Dipstick vents excessive pressure from the oil tank through a breather system consisting of