If one witness attests [the loan of] a barrel of wine, and the other, of a barrel of oil: — such a case happened, and it was brought before R. Ammi, who ordered him [the defendant] to repay a barrel ofSo a "barrel" of oil is worth more than the same of wine. That's nice to know. Of course, I'm relying on the translation from halakhah.com and that's always a worry.
wine out of [the value of] the barrel of oil.
FWIW, the legal principle here is that you need two witnesses. Since the value of the oil is higher, there are only two witnesses to the loan of the value of the barrel of wine.