1995 Audi A6

Try looking at your oil sening unit, if it has a protective tube covering the wire, follow it to the top, and check for oil coming from it, when these senders leak, they can leak into the electrical connector and pump the oil out the other end of the wire. If that's what's happening, replace the sender! If not degrease the whole engine and then let it idle, watch for leaks, it's easier to find one when the engine is clean!