Fuel & Oil Additives for Heavy-Duty Trucks

Keep your fleet running at peak performance with professional-grade additives for diesel, hydraulic, coolant, and lubrication systems. At Custom Truck One Source, we have the products that protect your engines, optimize fuel efficiency and extend component life—because downtime isn’t an option.

What Additives Do for Your Fleet

Performance Boost: Improve combustion efficiency and reduce engine deposits for cleaner operation.
Protection: Shield injectors, pumps and internal components from wear, corrosion and water contamination.
Longevity: Extend oil and fuel life, minimize service intervals and total maintenance costs.
Compliance: Many modern diesel additives help meet EPA emissions standards by supporting DPF and DEF systems.

Additives You’ll Find Here

• Fuel Treatments – Diesel conditioners, lubricity improvers, anti-gel formulas and water dispersants.
• Oil Additives – Viscosity stabilizers, friction modifiers and detergents for heavy-duty engines.
• Hydraulic & System Protectants – Anti-wear, anti-foam and seal conditioners to keep your hydraulic systems running strong.
• Coolant Additives – Corrosion inhibitors and SCA boosters for extended coolant life and system protection.

Why It Matters

Every truck, crane and service vehicle in your fleet relies on clean fuel, strong lubrication and reliable temperature control. Additives make that possible by:

• Preventing fuel gelling in cold weather.
• Improving lubrication in ultra-low-sulfur diesel.
• Reducing oxidation and sludge in hydraulic and oil systems.
• Protecting against corrosion, cavitation and scale buildup in cooling systems.

A small additive investment prevents expensive failures, towing bills and missed deadlines.

Built for Heavy-Duty Applications

Our additives are designed for:

• Diesel and gas engines on Class 6-8 trucks.
• Vocational and service body equipment exposed to harsh conditions.
• Fleet and municipal vehicles where uptime and reliability are critical.

Whether you have 5 trucks or 500, these products deliver consistency, longevity and compliance under heavy workloads.

Why Buy from Custom Truck One Source* Fleet inventory from top brands in fuel, oil and coolant additives.

• Parts experts who know vocational trucks.
• Nationwide shipping—get what you need when you need it.
• One-stop shopping for all chemicals, filters and service parts in your maintenance program.

Shop Now

Browse below or filter by type (fuel, oil, hydraulic, coolant). Not sure which product is for your truck or equipment?
👉 Talk to our parts team with your make, model, system type or fuel grade and we’ll recommend the right product.