i have 97 audi a8 oil leak in the front passender side of engine?

More than likely it is the crankcase ventilation hose at the very back of the engine. My 1999 4.2L Quattro had this problem and basically, over time , the hose dries and cracks, and small amounts of oil drip down on to the exhaust manifold. Part # for 1999 was 077-103-221-K or AB 024 F01 VENTHOSE