פירוש על עבודה זרה 71:9

The Talmud resolves the difficulty by suggesting that the decree against oil spread. First it began with a decree against using these products in the city, where the problem of fraternization was greatest. Then a later group of rabbis, perhaps a bit more zealous than Danied, added that using these products is forbidden even outside of the city, even though there is probably little or no concern there for fraternization.