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Well known and most liquid are (OIL) and (USO) with one to one relation to crude oil price. If you are more bullish or bearish with some part of oil business maybe you pick some speciality from ETF like following:
SPDR Oil & Gas Equipment & Services (XES), iShares Oil Equipment & Services (IEZ), SPDR Oil and Gas Exploration & Drilling (XOP), iShares Oil and Gas Exploration & Production (IEO)
Of course all are short able. But if you have no shorting available there is still one inverse ETF UltraShort Oil & Gas ProShares (DUG) with almost double leverage.
I have bookmarked this blog.Thank you for your excellent ETF lists-it gives all the information I need in a simple,easily accessible format.This site is a great place to start research.
Thanks Joe for your nice words. I appreciate.