Our full line of Shield motor oil has been formulated to meet the API SN Plus specification. Our products address low speed pre-ignition (LSPI) issues that pose increased risk for modern engines, including those with gasoline direct injection (GDI) and turbochargers. Shield ensures you get the full benefits out of your modern engines—including improved fuel efficiency. Look for the SN Plus donut on the back of the product labels to ensure you are getting the latest formulas.