US Cash Crude-Grades slip on final full day of cash roll trading period

Feb 25 (Reuters) - Grades fell on Tuesday, the final full day of the roll trade that traders use to manage their positions, dealers said.

Traders use the three-day roll period following the expiry of the WTI contract to square positions and manage exposure, resulting in more volatile trading.

Prices to roll U.S. crude oil positions from March to April traded at 25 cents a barrel, dealers said.

Elsewhere, Nigeria is producing 1.8 million barrels of oil per day, up from just one million barrels over a year ago, the country's minister of state for petroleum said on Tuesday.

Light Louisiana Sweet WTC-LLS for March delivery fell 20 cents to a midpoint of a $2.80 premium and was seen bid and offered between a $2.50 and $3.10 a barrel premium to U.S. crude futures CLc1

Mars Sour WTC-MRS fell 2 cents to a midpoint of a 98-cent premium and was seen bid and offered between a 70-cent and $1.25 a barrel premium to U.S. crude futures CLc1

WTI Midland WTC-WTM fell 20 cents to a midpoint of a $1.10 premium and was seen bid and offered between a $1.00 and $1.20 a barrel premium to U.S. crude futures CLc1

West Texas Sour WTC-WTS fell 40 cents to a midpoint of a 40-cent premium and was seen bid and offered between a 30-cent and 50-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 April futures LCOc1 fell $1.76 to settle at $73.02 a barrel

WTI April crude CLc1 futures fell $1.77 to settle at $68.93 a barrel

The Brent/WTI spread WTCLc1-LCOc1 narrowed 3 cents to last trade at minus $4.05, after hitting a high of minus $3.97 and a low of minus $4.10