Castrol MAGNATEC STOP-START 5W-30 C2 is suitable for use in automotive gasoline and diesel engines where the manufacturer recommends an ACEA C2 or API SN 5W-30. Castrol MAGNATEC STOP-START 5W-30 C2 is suitable for use in Peugeot and Citroen vehicles that require a 5W-30 lubricant approved to PSA B71 2290 specification and Fiat vehicles that require a 5W-30 lubricant that Meets Fiat 9.55535-S1 specification.