Oil Leak at head gasket on 1991 BMW 325i

Looking to buy this car from a mechanic, says he's invested $4000 in motor, looks like new head, radiator, H20 pump, etc., I looked at it and he admitted it has an oil leak. Between the head and block (looking through the exhaust manifold) after I drove it and warmed it up, saw oil leaking (not running) out. What do you think, What should I expect. He only wants $1500 and I really liked the way it ran and the condition (really clean and solid), except for the oil leak???

Asked by for the 1991 BMW 325i
If the engine was "just recently rebuilt" it shouldn't be leaking from the head gasket. If it does how good a job was done rebuilding the engine if the head.gasket leaks oil. I had a 325 myself its a great engine very reliable. Have a pre purchase inspection done by a garage with knowledge of BMWs ,if other items are found wrong with the car at least you can negotiate.price.
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