US Cash Crude-Grades little changed as traders await tariff announcement

April 1 (Reuters) - U.S. cash crude prices were relatively little changed on Tuesday, as traders awaited an expected announcement on reciprocal tariffs on Wednesday from President Donald Trump.

The White House provided no details about the size and scope of tariffs that it confirmed Trump will impose on Wednesday. The tariffs could intensify a global trade war.

Still, Trump's threats to impose secondary tariffs on Russian oil and to attack Iran fueled supply worries, limiting losses.

Traders also awaited U.S. government data on crude inventories due on Wednesday.

Industry data from the American Petroleum Institute showed that U.S. crude oil inventories rose by 6 million barrels in the week ended March 28, market sources said, citing figures on Tuesday.

In refining news, a fluidic catalytic cracker at Motiva Enterprises' refinery in Port Arthur, Texas, is expected to remain shut for two weeks after a second unsuccessful restart attempt over the weekend, sources familiar with plant operations said on Monday.

Light Louisiana Sweet WTC-LLS for May delivery firmed 20 cents at a midpoint of a $2.70 premium and was seen bid and offered between a $2.60 and $2.80 a barrel premium to U.S. crude futures CLc1

Mars Sour WTC-MRS was little changed at a midpoint of a 85-cent premium and was seen bid and offered between a 75-cent and 95-cent a barrel premium to U.S. crude futures CLc1

WTI Midland WTC-WTM weakened 5 cents at a midpoint of a 95-cent premium and was seen bid and offered between a 85-cent and $1.05 a barrel premium to U.S. crude futures CLc1

West Texas Sour WTC-WTS was little changed at a midpoint of a 20-cent premium and was seen bid and offered between a discount of 15 cents and 55-cent a barrel premium to U.S. crude futures CLc1

WTI at East Houston WTC-MEH, also known as MEH, traded between a $1.25 and $1.45 a barrel premium to U.S. crude futures CLc1

ICE Brent June futures LCOc1 fell 28 cents to settle at $74.49 a barrel

WTI May crude CLc1 futures fell 28 cents to settle at $71.2 a barrel

The Brent/WTI spread WTCLc1-LCOc1 narrowed to last trade at minus $3.73, after hitting a high of minus $3.72 and a low of minus $3.84.