Shares of Occidental Petroleum Corp. surged Friday, after Warren Buffett’s Berkshire Hathaway Inc. boosted its stake in the oil-and-gas company even as Wall Street was doing the opposite. But that ...

It doesn't matter if you have a hybrid or conventional gas-powered car, a good motor oil can make the difference between a long-lasting engine and a sputtery ride. Here's what you should look for when ...