
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.





















![Reintroducing The Mack Anthem Rebuilt For Regional Haul[79]](https://img.ccjdigital.com/mindful/rr/workspaces/default/uploads/2026/07/reintroducing-the-mack-anthem-rebuilt-for-regional-haul79.FdrR1gEDrK.jpg?auto=format%2Ccompress&fit=crop&h=167&q=70&w=250)
