Valvoline All-Fleet Superior LE-X 10W-40 is a high-performance semi-synthetic engine oil formulated to meet the rigorous demands of modern heavy-duty diesel engines. Engineered for fuel economy, oxidation resistance, and shear stability, this oil is designed for fleets operating in a wide range of service conditions — from long-haul highway driving to demanding stop-and-go urban delivery routes.

This engine oil is fully compatible with engines equipped with diesel particulate filters (DPF), exhaust gas recirculation (EGR), and selective catalytic reduction (SCR) systems. Its carefully formulated low-ash chemistry protects emission control devices from clogging and degradation, ensuring compliance with modern emission regulations while maximizing component lifespan.

The advanced additive technology in All-Fleet Superior LE-X delivers a comprehensive set of performance benefits: improved fuel consumption economy through reduced internal friction, superior high-temperature deposit control that keeps critical engine parts clean, effective foam suppression for consistent oil pressure, and outstanding soot dispersion that prevents oil thickening and viscosity breakdown. Additional protection includes oxidation inhibition, low-temperature sludge prevention, corrosion and rust resistance, valve train wear protection, and excellent TBN retention for extended drain capability.

All-Fleet Superior LE-X 10W-40 is suitable for on-road and off-road applications including agriculture, construction, and mining. It delivers excellent performance in mixed fleet environments where both modern and older heavy-duty diesel engines operate side by side, making it a versatile and cost-effective lubricant solution for fleet operators.