Phillips 66® Guardol ECT (Emission Compatible Technology) Diesel Engine Oil with Liquid Titanium protection additive is a premium-quality, part-synthetic 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 specifically formulated to be compatible with exhaust aftertreatment systems that use 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.

Available in multiple sizes, including drums and pails. Ideal for farms, fleets, and repair shops.