hello I am new here , I bought a used Audi A4 2006, soon after purchasing within 2hrs I got check engine , I took it back to him, after 2weeks he told he fixed everything but the coolant still loosing levels from trip to trip
i refilled with pentafrost to max , I drove upto 30miles now level came from max to min and the color of coolant changed from pink to a bit black
please help I want to take it back to mechanic
thankyou