A second shipment of crude from a U.S. Gulf of Mexico offshore field has sailed for Germany, according to vessel tracking data and trade sources on Tuesday, as European refiners test potential replacements for Russian oil, writes Reuters.

Europe is aiming to cut 90% of its Russian oil imports by the end of this year. Refiners are expected to look to Norway, the Middle East, the United States and West Africa for alternative supplies, according to analysts.

The hunt for substitutes has led in two recent instances to Mars, a US sour grade similar to Russia’s Urals.