WTI Oil FAQs What is WTI Oil? WTI Oil is a type of Crude Oil sold on international markets. Like all assets, supply and demand are the key drivers of WTI Oil price. How does inventory data impact the price of WTI Oil The weekly Oil inventory reports published by the American Petroleum Institute (API) and the Energy Information Agency (EIA) impact the price of WTI Oil. Their decisions often impact WTI Oil prices.