just keep pouring it in. Far cheaper then entrusting your car to some shop that will charge you big coin. I breathed this crap in when pouring cans of R12 into a old mazda that had a huge leak & man that made us feel queezy. I would think if it was leaking in the cabin you would know it.

As far as the ozone layer? Well does the Ozone layer or the eco-nazi scientists pay your bills? Do whats best for the pocketbook.