Cramer: Why I'm not a believer in the oil refinery stocks

It's that time again! Jim Cramer rang the lightning round bell, which means he gave his take on caller favorite stocks at rapid speed:

Berkshire Hathaway (B shares): "I would say that the investments that Warren Buffett has been making of late have not been performing that well, but to go against the master? No, thank you. I think Berkshire Hathaway is a buy. Period, end of story."

CoLucid Pharmaceuticals: "I've got to look into it. It just did a gigantic secondary and it's up huge since the secondary. I have to come back and do homework on that one."

Valero: "I am not a big believer in the refinery stocks right here. I don't think the margins are going to increase, I think they are going to shrink. I would be a seller of Valero."

NXP Semiconductors: "It's a big position for my charitable trust ... I think it is very inexpensive versus its growth rate and you should be a buyer."

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