Oil Leak on the Left Side of the Gearbox? Here’s the Fix! • Today we’re working on an Audi A3. We’re replacing the left transmission oil seal, specifically the driveshaft flange seal on the gearbox. On this model, the driveshaft doesn’t go directly into the gearbox — it’s first connected to a special flange, which is then bolted to the transmission. • During a routine inspection, we noticed oil traces on the left side of the gearbox — a clear sign that the seal was leaking. In this video, you’ll