It follows an index of stocks in the oil and gas industry, not oil itself but could be a good way to trade indirectly. For more info see their homepage.
Normally the 3x or 2x leveraged products are used to day or swing trade more than invest so search on the internet about the possible dangers of using leveraged ETF products long term. They can decrease in value even if the index or commodity they follow increases.
these are for the oil ones, if you buy one check the page to see if it uses a tax form 1099 otherwise you'll have to file extra return pages for limited partnership k-1 forms, costs extra to get them prepared and can be a pain to do. http://etfdb.com/type/commodity/energy/crude-oil/