BP Plc (NYSE: BP) will conduct planned maintenance on its 315,000 barrels per day (bbl/d) Olympic Pipeline in the U.S. Pacific Northwest starting May 5 through May 9, the energy company said.

BP alerted shippers of the planned maintenance in March, a spokesman said by email on May 3.

The 400-mile (644-km) pipeline transports petroleum products from Blaine, Washington to Portland, Ore.

Pacific Northwest gasoline and low-sulfur diesel differentials were little changed on Tuesday. Portland gasoline was pegged at a 7-cent to 8-cent a gallon premium to the NYMEX RBOB contract, while low-sulfur diesel remained at a 7-cent a gallon premium to the front-month heating oil contract.