THE VERSATILE WORKHORSE: GUARDOL® ECT® (SYNTHETIC BLEND) Performance Redefined. Built for Modern Emissions Standards.

Mammoth is proud to supply Phillips 66® Guardol ECT (Emission Compatible Technology), a premium-quality, part-synthetic API CK-4 engine oil. Specifically developed for four-stroke cycle diesel engines meeting 2007 and later EPA on-highway exhaust emissions standards, this formulation is the industry standard for protecting engines equipped with DPF, DOC, and SCR systems. It is fully backward serviceable, providing a high-performance solution for both your newest assets and your legacy pre-2007 fleet.

WHY MAMMOTH TRUSTS GUARDOL® ECT:

• Emission System Integrity: Specially formulated for total compatibility with modern exhaust aftertreatment hardware, ensuring your DPF, DOC, and SCR systems remain efficient and clog-free.

• Liquid Titanium® Protection: Fortified with exclusive Liquid Titanium® additive technology to provide a molecular-level shield against wear and friction in high-load, high-heat environments.

• Backward Serviceability: While engineered for the latest EPA standards, its robust chemistry provides premium protection and extended life for older diesel engines requiring CJ-4 or CI-4.

• Oxidation & Soot Control: Advanced synthetic blend chemistry fights oil thickening and sludge buildup, maintaining optimal viscosity and engine cleanliness even under severe service conditions.