NEW YORK, July 25 (Reuters) - U.S. cash crude grade differentials were mixed on Wednesday in the final day of monthly roll trade, with offshore crudes LLS and Mars both firming.
U.S. front-month futures, for September, gained 47 cents to settle at $88.97 per barrel, while European Brent rose to 97 cents a barrel to settle at $104.38.
Brent's sharper rise widened the transatlantic crude spread to $15.41 a barrel, up from around $15 per barrel on Tuesday.
Roll trade for August delivery cash crudes ended Wednesday. During the three-day roll period traders often scramble to buy or sell cargoes before a monthly pipeline booking deadline.
Louisiana Light Sweet LLS- traded at $17.50 a barrel over West Texas Intermediate on Wednesday, up 40 cents a barrel from Tuesday.
Mars sour blend MRS- traded by as much as $10.20 a barrel over WTI, up from as much as $9.60 per barrel over WTI on Tuesday.
Thunder Horse THH- was weaker, trading for $11.30 above WTI, down from $11.75 above WTI on Tuesday.
WTI at Midland WTM- traded for $1.25 a barrel below WTI, down from 70 cents below on Tuesday. (Reporting By New York Energy Desk)