Oct 17 (Reuters) - Grades broadly rose on Friday, dealers said, as refinery demand weakened.

A fire at BP's BP.L 440,000 barrel-per-day oil refinery in Whiting, Indiana, was extinguished on Friday morning, the company said.

Reuters earlier reported multiple units were offline, according to two market sources, citing data from consultancy Wood Mackenzie.

On the supply side, U.S. energy firms this week added oil and natural gas rigs for the first time in three weeks, energy services firm Baker Hughes BKR.O said in its closely followed report on Friday.

The oil and gas rig count, an early indicator of future output, rose by one to 548 in the week to October 17.

* Light Louisiana Sweet WTC-LLS for November delivery fell 5 cents to a midpoint of a $2.10 premium and was seen bid and offered between a $2.00 and $2.20 a barrel premium to U.S. crude futures CLc1

* Mars Sour WTC-MRS rose 5 cents to a midpoint of a $1.05 discount and was seen bid and offered between a 95-cent and $1.15 a barrel discount to U.S. crude futures CLc1

* WTI Midland WTC-WTM fell 5 cents to a midpoint of a 55-cent premium and was seen bid and offered between a 45-cent and 65-cent a barrel premium to U.S. crude futures CLc1

* West Texas Sour WTC-WTS fell 3 cents to a midpoint of a 28-cent discount and was seen bid and offered between a 25-cent and 30-cent a barrel discount to U.S. crude futures CLc1

* WTI at East Houston WTC-MEH, also known as MEH, traded between a 80-cent and $1.00 a barrel premium to U.S. crude futures CLc1

* ICE Brent December futures LCOc1 rose 23 cents to settle at $61.29 a barrel

* WTI November crude CLc1 futures rose 8 cents to settle at $57.54 a barrel

* The Brent/WTI spread WTCLc1-LCOc1 widened 7 cents to last trade at minus $4.14, after hitting a high of minus $3.98 and a low of minus $4.15

(Reporting by Georgina McCartney; Editing by Lisa Shumaker)

((Georgina.McCartney@tr.com))