Ok just went to get an oil change on a 1987 190E 2.3 77,000miles and was told I had a head gasket leak. He also said it wasn't that big of deal just watch the oil level and I would be fine. Is this correct? Should I not worry about it? This is a car I would like to keep for a while. If i elected to have this replaced what kind of cost should I be looking at? thanks for your help