Phillips 66® Guardol Fleet EC (Emission Compatible) Diesel Engine Oil, formerly known as Fleet Supreme EC, is an API CK-4 engine oil developed for use in four-stroke cycle diesel engines designed to meet 2007 and later EPA on-highway exhaust emissions standards. It is specially formulated for compatibility with exhaust aftertreatment systems using diesel particulate filters (DPFs), diesel oxidation catalysts (DOCs) and/or selective catalytic reduction (SCR). It is backward serviceable for use in pre-2007 diesel engines.
• Excellent protection for newer low-emission diesel engines and older diesel engines
• Specially formulated to protect exhaust aftertreatment systems
• Protects against particulate filter plugging
• Excellent soot control for protection against abrasive wear and soot-induced oil thickening
• Excellent resistance to viscosity and thermal breakdown at high temperatures
• Protects against sludge and varnish formation
• Protects against rust, bearing corrosion and wear
• Good resistance to foaming and aeration
