http://www.mobiloil.com/USA-English/MotorOil/Oils/Mobil_1_Extended_Performance.aspx
"Mobil 1 Extended Performance has an even more robust formula that has been proven in extensive field tests to help protect critical engine parts for 15,000 miles between oil changes. Guaranteed. We’ve selected specific synthetic components to deliver this outstanding level of performance."
http://www.mobiloil.com/USA-English/MotorOil/Oils/Mobil_1_Extended_Performance_FAQs.aspx#FAQs3
So what are these specific synthetic components that Mobil1 is talking about?
"Mobil 1 Extended Performance has an even more robust formula that has been proven in extensive field tests to help protect critical engine parts for 15,000 miles between oil changes. Guaranteed. We’ve selected specific synthetic components to deliver this outstanding level of performance."
http://www.mobiloil.com/USA-English/MotorOil/Oils/Mobil_1_Extended_Performance_FAQs.aspx#FAQs3
So what are these specific synthetic components that Mobil1 is talking about?