The Oils-Energy group has plenty of great stocks, but investors should always be looking for companies that are outperforming their peers. Has Core Laboratories (CLB) been one of those stocks this year? By taking a look at the stock's year-to-date performance in comparison to its Oils-Energy peers, we might be able to answer that question.Core Laboratories is one of 246 individual stocks in the Oils-Energy sector. Collectively, these companies sit at #16 in the Zacks Sector Rank. The Zacks Sector Rank inclu ...