Lubrication Engineers Inc.’s Monolec Ultra Syn Heavy Duty Engine Oil is a broad-range multiviscosity synthetic oil for diesel engines formulated to deliver year-round performance, wear protection, fuel efficiency and extended drains.

With its synthetic base oil and proprietary additive package, the SAE 5W-40 oil is designed to perform in low-temperature conditions; its high viscosity index indicates less change in viscosity over a broad operating temperature range.

Typical applications include Class 8 tractor-trailer trucks, construction vehicles and other off-road mobile equipment.