Worth it or walk away?

Considering buying a 2014 Audi A6 with 151,963 miles—seller is asking $6,600, but it needs about $5,057 in repairs, including an oil leak (between engine & transmission), coolant flush (black coolant), broken air intake hose, defective engine mount control solenoid, brake flush, serpentine belt replacement, and cabin air filter replacement. Worth it or walk away?