Automotive Air Conditioning Information Forum

That is always a tricky question. Even a tiny system like yours has a few ounces of oil.

Try to imagine how much of a mess a shotglass full of oil poured out would make. That is a ounce. Was there a big oily mess at the leak? Or dump a teaspoon of coffee on the kitchen counter - was there that much oil on things?

Adding back a half ounce of oil is not likely to cause any trouble. You need to gauge the actual size of the oil loss, which can be a challenge. If things were mostly dry, then adding is not necessary.

No I did not see any oil, just a small amount of UV dye around the plug. Thanks for all the help, I really appreciate it!