By Mike Anderson, Senior Editor | September 28, 2010

Citgard SynDurance 5W-40 synthetic oil is designed for year-round use in heavy-duty engines regularly subjected to a wide range of operating temperatures. The high- and low-temperature properties of the Citgo product offer a solution from having to switch between SAE 10W-30 in winter and 15W-40 during summer. Advanced additives help exceed the evolving performance requirements of low-emission engines, including Exhaust Gas Recirculation (EGR) systems. SynDurance 5W-40 is designed to exceed the requirements of all API CJ-4 engine manufacturers' specifications.