I have Audi A4, 1995, 1.8. It done 165000miles. Since last five years there was small oil leak, two weeks ago I added "Stop Oil leak" and now leak got bigger. Its leaking from above the oil filter, so its not oil filter. Breather hose seems cover in oil too. Does any Audi driver had similar problem? If yes what did you do?
I recently had the same problem with my 1998 Audi A4 1.8 and during my last MOT the man advised me to try the oil pressure switch which is just above the oil filter housing. The part cost £10 from a Audi dealer and took ten minutes to replace.Hope this helps you.