SO i have 24 oz of r134a IN THE SYSTEM with 28 oz capacity and i hear some people say ' u can overcharge it ' and others say ' u cant over charge it '

QUESTION #1)

should i stick another 12 oz can in the system or leave it with just the 2 cans in there ?
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its blowing cold so i m happy now ..

but , i think i need to add 2 oz of oil .

QUESTION #2)

Can I add it by sticking the refrigerant oil can ( now without its own pressure) upside down in the low side port with ac on max and just have it 'suck in' ?
or do u have to have pressure in a can when u add it to the low side port ?

its just a car to get from pt a to b usually it does it nicely --AIM: chronon1 95 Tour SE, 2.5 lliter 24V DOHC V6, 5 speed manual