HOUSTON, July 19 (Reuters) - California gasolinedifferentials extended declines on Friday after a SanFrancisco-area refinery that had shut a unit resumed normaloperations.
Royal Dutch Shell reported an unspecified unitshutdown to regulators on Sunday. On Friday the companyconfirmed that the refinery had returned to normal operations.
Los Angeles July-delivery CARBOB gasoline differentialsslipped by 6 cents per gallon to 11 cents under August RBOBfutures on the New York Mercantile Exchange on Friday, traderssaid.
San Francisco Bay market CARBOB was seen 11 cents under theL.A. price.
Differentials in both California markets went from premiumsto discounts to NYMEX RBOB this week, despite a few refineryupsets, after U.S. government data showed that West Coast stocksgained 818,000 barrels last week.
However, gasoline in the Portland, Oregon, market partlyrebounded from the week's declines on Friday, gaining 2 centsper gallon to 6 cents over August RBOB futures, traders said.
Gasoline in the Portland market took a dive this week onrobust supply as well, falling by 19 cents per gallon over fourdays before rolling that back on Friday to a 17-cent declineover the week.
L.A. CARB diesel differentials slipped by 1.25 cents pergallon to 1.25 cents over August heating oil futures on Friday,while San Francisco CARB diesel were flat at 2 cents over.
Portland diesel was seen even to the board.
L.A. jet fuel differentials fell by 1.5 cents per gallon to7 cents under, traders said. (Reporting by Kristen Hays; Editing by Chizu Nomiyama)