Phillips 66 Guardol ECT 15w-40 with Liquid Titanium is a premium semi-synthetic Diesel Engine Oil. Guardol series is a premium diesel engine oil line manufactured by Phillips 66 Lubricants. "ECT" refers to "Exhaust Compatible Technology" because it is specially formulated for compatibility with exhaust after treatment systems using diesel particulate filters (DPF), diesel oxidation catalysts (DOC) and/or selective catalytic reduction (SCR). 15w-40 is the thickness of the oil based on Society of Automotive Engineers (SAE) standards. Liquid Titanium is an exclusive, high performance additive found in Phillips 66 premium engine oils.
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