A tech came out and said he cannot find the leak and I have oil all over the coil. He said I need a new coil. The problem is they don't make that part anymore. Can another tech find the leak or is it this tech that doesn't want to find?

It all depends on what the coil is made from and if the leak can be found. Copper coils are easy to fix... corroded aluminum ones are very difficult at best.

This is the problem. They keep coming out putting freon in my a/c. They said that they cannot find the leak that I need a new condenser coil, but they cannot find one for my unit. Now they are telling me that they will send out another tech from an outside air-conditioning company to look over my air to see if they can fix it. The tech said that on condenser has oil all over it. I want a new unit. I have a maintenance contract that's why they don't want me to get a new unit. They want someone to try to fix it.

Now having just realizerd this... are we talking the inside part or the outside part.

THe condenser is part of the outside compressor, the evaporator is the inside part. Easier to replace the inside part with a compatible one VS what's on the compressor.

This is on the outside