"I think oil has bottomed. I think we should be buying oil stocks," said Jim Cramer on Wednesday's "Stop Trading!" segment on CNBC. "The multiples are the lowest I've seen, and if oil stays in the $40s, these companies are going to make a lot of money."

He specifically recommended Exxon ( XOM), ConocoPhillips ( COP), Terex ( TEX) and Occidental ( OXY). "I want that dividend," he said.

Copper inventories "have been going down, down, down, down, down," Cramer said. "I believe that this is a sign that the Chinese stimulus is working. He said that Freeport-McMoRan ( FCX) "is ramping, and I don't think it's done."

Caterpillar ( CAT) is experiencing a "big short-cover rally," Cramer said. That said, "You can't build roads and bridges without CAT, so maybe the money is going to start trickling down."

Cramer said that people "confuse BJ's ( BJ) with Costco ( COST)." Whereas Costco sells avoidable products such as electronics and jewelry, BJ's "is much more staple, staple, staple." Costumers at BJ's and Big Lots ( BIG) can "buy cheaper products and more of them."

Last night, Cramer said, Aecom ( ACM) "did a secondary at $20, and if you bought it, you're up a buck. When is the last time that happened?" He said it's an "extra signal that there's demand."
At the time of publication, Cramer was long ConocoPhillips, Caterpillar and Freeport.

Jim Cramer is a director and co-founder of TheStreet.com. He contributes daily market commentary for TheStreet.com's sites and serves as an adviser to the company's CEO. Outside contributing columnists for TheStreet.com and RealMoney.com, including Cramer, may, from time to time, write about stocks in which they have a position. In such cases, appropriate disclosure is made. To see his personal portfolio and find out what trades Cramer will make before he makes them, sign up for Action Alerts PLUS. Watch Cramer on "Mad Money" weeknights on CNBC. Click here to order Cramer's latest book, "Mad Money: Watch TV, Get Rich," click here to order his book, "Real Money: Sane Investing in an Insane World," click here to get his second book, "You Got Screwed!" and click here to order Cramer's autobiography, "Confessions of a Street Addict." While he cannot provide personalized investment advice or recommendations, he invites you to send comments on his column by clicking here.

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