Indian investors can buy United States Oil Fund (USO) through the following modes:
1. Direct investment: One can invest through opening an International Trading Account with Angel One. Once account is opened, you can add funds in U.S. dollars to buy United States Oil Fund (USO).
2. Indirect investment: One can invest indirectly in United States Oil Fund (USO) through mutual funds and Exchange Traded Funds (ETFs) that offer exposure to global stocks.