Extend drain intervals.
Heavy-duty, professional-grade CountryMark Advantage® Lubricants™ hold up to extreme heat and cold with additives to minimize engine wear, extend drain intervals and reduce maintenance costs. In other words, they’re formulated to exceed your toughest standards to deliver peace of mind where it matters most: down the road.
Your trucks are your most valuable investments. Protect your livelihood with a lubricant designed to keep you on the road.
CountryMark Advantage Lubricants always go the distance, extending drain intervals and protecting your bottom line.
Choose the blend that protects your investments.
Three high-quality blends bring top performance for every budget.
Heavy Duty Diesel Engine Oil 15W40
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Exceptional wear and protection
Minimizes soot-related abrasive wear and offers outstanding cylinder, bearing and ring wear results. -
Enhanced performance and extended drain
Extends drain intervals, improves soot control, provides faster lubrication during cold starts and maximizes engine performance. -
Exceptional properties
Improved oxidation protection and aeration control.
Synthetic Blend Heavy Duty Diesel Engine Oil 10W30
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Strong oxidation and thermal stability
Designed with advanced technology including improved oxidation and thermal capacity. More robust formula will resist breaking down at higher operating temperatures, allowing equipment to operate more effectively. -
Superior soot performance
Blended with a proven detergency and dispersant package to shield the engine from low temperature sludge buildup and high-temperature deposits. -
Exceptional cold weather start-up
Provides maximum cold weather start-up protection in temperatures as low as -40°F.
Full Synthetic Heavy Duty Diesel Engine Oil 5W40
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Extended drain
Designed with advanced technology that extends oil drain intervals, improves soot control, provides faster lubrication during cold starts and maximizes total engine performance. -
Improved fuel economy
Delivers greater than 2% fuel economy over conventional oils under all driving conditions. -
Additive technology
Delivers exceptional low-temp flow properties, oxidation stability, viscosity retention and deposit control. Provides added varnish and sludge protection to keep engines clean and minimizes deposit formation.
