Schaeffer SynShield Ultra Performance 10W-30 is a heavy-duty diesel engine oil formulated to provide outstanding protection against wear, oxidation, deposit formation, soot contamination and aeration. Engineered for applications that involve significant stop-and-go, excessive idling, short haul and/or severe duty operating conditions, SynShield Ultra Performance is formulated for both on-highway and off-highway usage. Suitable for use in 2007 and 2010 emission compliant engines that utilize heavy exhaust gas recirculation and exhaust after-treatment devices such as diesel particulate filters, with or without diesel oxidation catalysts and selective reduction, Schaeffer diesel engine oil provides a multitude of performance benefits. From its superior low volatility characteristics that control oil consumption to its high thermal and oxidative stability, SynShield Ultra Performance is the clear choice for premium, advanced, diesel motor oil.