I have converted my Elky to the new R-134 changed the dryer and all of that new compressor and all new o rings. I even put in the florescent green oil for easier detection of leaks. My system is staying charged and running cool. But on occasions I can find a few florescent green oil under the hood. I even purchased a Black light to help see if I can determine where the leak is coming from. Any other suggestions on how or what I can use to help pin point this problem. It is running good and cold and it is holding charge . 80 Elcamino. 350 motor New. New Compressor new Dryer, New O-Rings Thanks

Wash the engine compartment, don't run a/c, park overnight and check with black light again.