Recently had my 2003 Passat V6 serviced for oil loss and hot oil/burning smell after driving by a reputable local shop. They changed the water pump and tensioners and etc. When I picked up vehicle from that service, the heater temperature control did not work and they had to "burp" the cooling system. Now I've had to add amost a gallon of the Dexcool coolant over the past 4500 miles. No external signs of coolant leaks or no evidence of coolant in the crankcase. Reputable service shop nows says there may be a leaking headgasket that will require 2 days of labor to see if there is coolant leaking into cylinders. Anyone have similar issues? Car has 90,000 miles and I'm original owner. Serviced every 5,000 miles since new and never had an issue with coolant loss even though it has been changed/flushed at recommened intervals up to now.