פירוש על עבודה זרה 147:10

According to Rav, the halakhah follows R. Shimon b. Gamaliel’s more lenient opinion only when casks of yayin nesekh get mixed up. But if wine falls into other wine, it is all strictly prohibited. But all other amoraim (and the list is quite long) hold that the halakhah follows R. Shimon b. Gamaliel in all cases—the wine may always be sold except for the amount of yayin nesekh that fell in.