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It's pretty easy to test AC systems for leaks. It involves putting a dye into the system, charging it with gas then looking at all the pipes, connectors etc. through special glasses. The dye will come out through the hole and when you are wearing the glasses, you will see it kind of glowing and see exactly where the leak is. I agree with the above though, it's probably one of the Schrader valves. If it's not that, it's likely to be an O-ring. One thing you can do is to pour soapy water onto the valves and you might be able to see bubbles coming which would indicate that's the problem.

i don't really like to copy and paste stuff, but sometimes there is no simpler way: "Briefly, there are two types of "synthetic" oils on the market. Group IV oils consist of molecules that are synthesized from simpler chemical compounds. This lets the chemical engineers "tune" the characteristics of a lubricant to exact specifications. These oils flow more freely at extreme low temperatures and don't break down at very high temperatures. As a side benefit, they generally can be specified one or two grades lighter than a mineral oil, which consumes less energy as friction inside the engine and saves fuel." For more please read here: http://www.popularmechanics.com/cars/how-to/a2316/4232672/ If you still want to read more then go through this PDF: Oils produced by synthesis (chemical reaction) rather than by extraction or refinement. Many (but not all) synthetic oils offer immense advantages in terms of high temperature stability and low temperature fluidity, but are more costly than mineral oils. Major advantage of all synthetic oils is their chemical uniformity. 70% of synthetics contain Polyalphaolefin. [note: Polyalphaolefin is a chemical ] Synthetic Oil is entirely produced by a chemical process. Like H20 is a chemical compound, normally know as water and NaCl is a chemical compound commonly know as Table Salt or simply salt. We have a chemical compound which we call Synthetic Oil. Produced and fine Tuned by Chemical Engineers. For more read this link's content: http://www.rsareliability.com/Report on Synthetic Oil.pdf The comments that i leave here are not for winning an argument (take it or leave it), you could have more knowledge than me on a subject or vice versa. I come here to learn and not to fight. Hope that the above mentioned helps answer a few questions and concerns. Peace out buddy.