oil is leaking into the turbo and the shop says I need new engine what causes the oil leak

Engine Oil Leaks on Audi A4 Engine oil leaks are common from the valve cover gaskets and camshaft chain tensioner gasket. RepairPal Verified Average mileage: 121,507 (15,000–226,000) Engines affected: 1.8L 4 Cylinder Turbo, 2.0L 4 Cylinder Turbo, 2.8L V6, 3.0L V6 15 model years affected: 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2013 46 people reported this problem... Several Thousand $$$$$ to fix it......