Shell Helix Ultra Professional AP-L 5W-30 is a premium-grade, fully synthetic engine oil scientifically formulated with our ultimate active cleansing technology. It works hard to continuously prevent dirt and sludge build-up while protecting sensitive exhaust gas treatment systems. Shell Helix Ultra AP-L is designed specifically to provide our ultimate engine cleansing and protection for Peugeot and Citroen gasoline and diesel engines requiring oils meeting their specification PSA B 712290 including those with diesel particulate filters. It is suitable for normal and extended service use. Shell Helix Ultra AP-L is also designed for flat vehicles requiring the flat 9.55535 S1 specification. With Shell Helix Ultra AP-L you know you are doing the right thing for your car.