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nah, hes right. it definitely leaks less. r134a can leak straight out of a hose that otherwise wouldnt have leaked r12.. r12 does work better, but it gets over 100 here and i havent had issues with r134.. cooler is always better, but the hassle of r12 isnt worth the benefit of a little colder air when mines already too cold on full blast. but the leaking is a valid point.
but with an old car, usually all the r12 leaked out because something was worn out anyway. if you paid a bunch to recharge, theres a pretty good chance your fresh charge would just leak out again too.. you can just replace everything and pray you didnt miss anything at all and recharge, or use r134a and not really worry about it.
ac work is really expensive.. when you try to add in r12 it gets even more expensive and a bigger hassle and less availability.
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