US Cash Crude-Grades rise as WTI/Brent spread widens

Oct 6 (Reuters) - Grades broadly rose on Monday, dealers said, as 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 $4.15 a barrel. A discount of around $4 suggests an open arbitrage window.

U.S. oil refiners are expected to have about 1.7 million barrels per day (bpd) of capacity offline in the week ending October 10, decreasing available refining capacity by 226,000 bpd, research company IIR Energy said on Monday.

Offline capacity is expected to increase to about 1.2 million bpd in the week ending October 17, IIR said.

* Light Louisiana Sweet WTC-LLS for November delivery fell 15 cents to a midpoint of a $2.15 premium and was seen bid and offered between a $2.10 and $2.20 a barrel premium to U.S. crude futures CLc1

* Mars Sour WTC-MRS rose 10 cents to a midpoint of a 50-cent discount and was seen bid and offered between a 60-cent and 40-cent a barrel discount to U.S. crude futures CLc1

* WTI Midland WTC-WTM rose 15 cents to a midpoint of a 90-cent premium and was seen bid and offered between an 80-cent and $1.00 a barrel premium to U.S. crude futures CLc1

* West Texas Sour WTC-WTS rose 5 cents to a midpoint of a 5-cent premium and was seen bid and offered between a discount of 10 cents and a 20-cent a barrel premium to U.S. crude futures CLc1

* WTI at East Houston WTC-MEH, also known as MEH, traded between a $1.05 and $1.25 a barrel premium to U.S. crude futures CLc1

* ICE Brent December futures LCOc1 rose 94 cents to settle at $65.47 a barrel

* WTI November crude CLc1 futures rose 81 cents to settle at $61.69 a barrel

* The Brent/WTI spread WTCLc1-LCOc1 widened 12 cents to last trade at minus $4.12, after hitting a high of minus $4.01 and a low of minus $4.15