my 16v is leaking a small amount of oil. the oil appears to be coming from just below the exhaust manifold. does this sound like the head gasket? if so, how much should i expect to pay to have this replaced? i'm sure it won't be cheap but i want to get an idea. since i'll would be paying mostly for the labor to take the head off, what else should i have done while it's off?

thanks

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dew
86' 190e 2.3L 16v