US Cash Crude-Grades mixed on final day of volatile roll trade period

Oct 24 (Reuters) - Physically traded U.S. crude grades were mixed on Friday, dealers said, with sour grades trading higher on the final full day of the volatile roll trading period.

Traders use the three-day roll period to adjust their crude slates, square up positions and net out exposures following the expiration of the U.S. crude futures contract.

Prices to roll U.S. crude oil futures positions from November to December traded at a midpoint of 80 cents a barrel, steady on the day.

The spread between West Texas Intermediate crude futures and global benchmark Brent widened, which typically makes U.S. grades more attractive to foreign buyers.

The discount WTCLc1-LCOc1 widened to as much as minus $4.44 a barrel. A discount of around $4 suggests an open arbitrage window.

Meanwhile, BP's BP.L 440,000 barrel per day oil refinery in Whiting, Indiana, resumed operations on Friday after a outage prompted a temporary evacuation at the plant, the company said.

The refinery resumed operations after power was restored, BP said in a statement.

Light Louisiana Sweet WTC-LLS for November delivery fell 10 cents a midpoint of a $1.53 premium and was seen bid and offered between a 75-cent and $2.30 a barrel premium to U.S. crude futures CLc1

Mars Sour WTC-MRS rose $1.10 a midpoint of a 40-cent discount and was seen bid and offered between a 50-cent and 30-cent a barrel discount to U.S. crude futures CLc1

WTI Midland WTC-WTM fell 15 cents to a midpoint of a 25-cent premium and was seen bid and offered between a 15-cent and 35-cent a barrel premium to U.S. crude futures CLc1

West Texas Sour WTC-WTS rose 8 cents to a midpoint of a 45-cent discount and was seen bid and offered between a 55-cent and 35-cent a barrel discount to U.S. crude futures CLc1

WTI at East Houston WTC-MEH, also known as MEH, traded between a 60-cent and 80-cent a barrel premium to U.S. crude futures CLc1

ICE Brent December futures LCOc1 fell 5 cents to settle at $65.94 a barrel

WTI December crude CLc1 futures fell 29 cents to settle at $61.5 a barrel

The Brent/WTI spread WTCLc1-LCOc1 widened 21 cents to last trade at minus $4.41, after hitting a high of minus $4.10 and a low of minus $4.44