2003 Ford Taurus leaking passenger side by oil pan?

Oil pan gasket been changed 3 times because I thought that was the problem.still dripping the smallest bit of oil. No puddle because exhaust is right under drip so there s a smell from time to time. But I can see oil on the bottom of car by oil pan. Timing cover gasket was replaced, head gaskets been replaced. What else could be causing the leak?shop says it HAS to be the oil pan even no there no visible damage to it. They re going to charge me 250$ for have it replaced.before I make the decision I need opinions since I ve already put too much money into it already. Still need to drive for 2 years. Small oil leak worth the money to fix?

Read more: 2003 Ford Taurus leaking passenger side by oil pan?