Depending upon the specific vehicle and repair in mention, the cost to repair an oil leak can be anywhere from $100 to $1000. There can be many reasons for an oil leak. The most common cause is a degraded oil-pan gasket.
The first step to identifying the price of a repair is to assess where the actual leak is coming from. If old, burnt oil is slowly leeching from the top side of an engine, the vehicle probably needs a new head gasket. If oil is dripping from the oil pan that is attached to the underside of the vehicle, a new oil-pan gasket should be installed. The gaskets are cheap, anywhere from $10 to $75, but the labor can be expensive.