Her is an interesting comment From Mobil about their M1 ESP for diesels. Notice some imported materal
http://www.mobiloil.com/USA-English/MotorOil/Car_Care/AskMobil/Is_Mobil_1_ESP_Imported.aspx
http://www.mobiloil.com/USA-English/MotorOil/Car_Care/AskMobil/Is_Mobil_1_ESP_Imported.aspx