My layover ended up being 7 hours, so I tried most of them This is not a bad airport at either t2 or t3 for priority pass- though I am trained to have very low expectations as there are some truly terrible PP lounges out there.

T2 international

• gol premium lounge- probably my favorite overall at GRU, big open space, warm yet modern decor, bathroom faucet spouts come from ceiling, lots of food choices, not the highest quality but at least hot food options.
• the lounge st palo- impressive selection of liquor and cocktails , fewer food choices than GOL though similar quality. The lounge is a bit narrow/bowling alley like, though is still not bad place to kill a few hours.

T3 international

• Safra- did not try since it closes to PP after 2pm, which is unfortunate as it sounds like it would be the best.
• W lounges - reviews are accurate, the lounge is tiny and I did have to wait 10 minutes to get in. Food is better than any of the T2 lounges tried. There is a second location at the end of one of the international piers, I imagine this one is probably quieter, but otherwise looks to be the same from outside.
• Bleriot - drinks are good, despite great reviews food is very much "airport quality"
• Paris 6 - did not try
• tryp - very unusual lounge, it's a hotel lobby where you can choose either their buffet , or to sit near the bar with an al la carte allowance. Did lobby bar, drinks were good, food was pretty bad. Hard to tell but the Buffet looked like it might have been O.K.