I use a simple system to judge the olive oil I buy. For salads I buy it in those slim black bottles with the square bottoms ~ the reason has nothing to do with elemental "quality" but with AGE. The bottles are smaller, look smart on the counter, and I'll use the oil up on salads and veggies sooner rather than later.
I buy Spanish grown olive oil for everything else. The reason is it's higher quality (no stuff floating in it), always the same quality bottle after bottle, year after year, and has good shelf life.
The virgin/extravirgin nonsense is for the food phonies!
Except the Olive Oil terms aren't measures of weight or measure but grade- the government doesn't have authority over that.
Not really. The first press is the best.