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The U.S. may be the world's biggest producer of crude oil, but that's not the case for motor oil. The cost of lubricants is soaring, and even a tentative deal to end the war won't solve the problem.
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President Donald Trump said Tuesday that "Russia should make a deal" to end its four-year war in Ukraine.
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Stock markets rallied worldwide, and oil prices eased after the United States and Iran reached a tentative deal to get the global flow of crude going again.
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