Jim Cramer's Lightning round: Petrobras, Alcoa, Merck and more
Rambus: It's time to take profits on this stock, Cramer said.
Matador Resources: Go with rival EOG Resources instead, Cramer said.
Petrobras: Cramer continues to like this oil stock.
Alcoa: The aluminum maker's stock has been climbing slowly, Cramer said. He's a buyer.
Merck: This pharma lacks a vision right now, Cramer said. "Don't buy."
ConocoPhillips: Cramer called this a terrific stock.
United Rentals: This stock could go to $80 a share before Cramer would consider it expensive.
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