Castrol MAGNATEC STOP-START 5W-20 E is approved for use in vehicles that require a 5W-20 lubricant that Meets Ford WSS-M2C948-B specification. All cars, even those with the latest stop-start engine technology dont perform at their best in traffic congestion. And congestion has dramatically increased over the past 10 years, causing engine wear and wasting fuel. Thats why we created new MAGNATEC STOP-START, combining patented DUALOCK molecule technology with Castrols most efficient full synthetic base oils.