The Nasdaq website offers a crude oil price chart that allows selection of a graphing period at increments ranging between seven days and 10 years. The chart shows the end of day commodity future prices for the WTI oil grade for the selected period.
Another website that provides crude oil price charts is InfoMine, which has options for various time frames, from one week up to five years. This site also allows the choice of viewing the price in various worldwide currencies.
The MarketWatch website shows a daily chart that details oil price fluctuations for the current day, as well as providing graphs with an adjustable timeline between one day and 10 years.