Commercial Vehicle Lubricants

Supporting Modern Commercial Fleets

Commercial vehicles place significant demands on their lubricants. Extended operating hours, high engine loads, stop-start driving, temperature changes and modern emissions systems all make correct product selection increasingly important.

Rock Oil products are designed to help:

• Protect engines, transmissions and driveline components against wear.
• Support reliable performance under heavy-duty operating conditions.
• Maintain engine cleanliness and lubricant stability.
• Support extended service intervals where permitted by the vehicle manufacturer.
• Reduce maintenance-related downtime and operational disruption.
• Provide practical lubricant solutions across mixed commercial fleets.

Explore the TRUCK-GUARD® Range

TRUCK-GUARD® is Rock Oil’s specialist range of heavy-duty commercial vehicle engine oils.

The range includes mixed-fleet, low-ash, synthetic and semi-synthetic formulations developed for haulage vehicles, buses, coaches and selected off-highway applications. Products are available across a wide selection of viscosity grades and performance levels, helping fleet operators match the lubricant to the vehicle, engine technology and operating environment.

Selected TRUCK-GUARD® products are formulated around relevant API, ACEA and manufacturer requirements, including recommendations and approvals associated with manufacturers such as Mercedes-Benz/Daimler Truck, Volvo, Scania, MAN, Renault, Mack and Cummins.

The range also includes formulations suitable for modern engines fitted with emissions-control and exhaust after-treatment systems, alongside products for older vehicles and mixed-age fleets.

Engine Protection for Demanding Operations

Commercial vehicle engines are frequently exposed to long operating hours, heavy loads and extended periods at working temperature.

TRUCK-GUARD® products are developed to support:

Wear Protection

Advanced formulations help protect critical engine components operating under load, supporting reliability and long-term engine life.

Engine Cleanliness

Detergent and dispersant technology helps control deposits, soot and contamination, supporting cleaner engine operation.

Oxidation and Thermal Stability

Products are designed to resist lubricant breakdown during demanding operating cycles and extended periods of use.

Low-Ash Performance

Selected low-ash formulations support vehicles fitted with modern exhaust after-treatment systems, including diesel particulate filters and related emissions-control technology.

Extended Drain Capability

Selected products are suitable for extended oil-drain intervals where permitted by the relevant vehicle manufacturer, helping fleets reduce servicing disruption and lubricant usage.

Gear, Axle and Driveline Protection

Rock Oil’s GEARAXL range provides lubricant solutions for commercial vehicle gearboxes, axles, differentials and associated driveline systems.

The range includes advanced synthetic, synthetic, mineral EP and limited-slip gear oils. These products are engineered to support wear protection, driveline reliability and smooth operation under high loads and demanding operating conditions.

Selected formulations are available for extended-drain applications and carry specifications, approvals or recommendations from commercial vehicle and driveline manufacturers.

Automatic and Manual Transmission Fluids

Rock Oil supplies a comprehensive range of automatic and manual transmission fluids for commercial vehicles and specialist applications.

The range includes ATF and MTF products, alongside dedicated fluids for selected heavy-duty automatic transmissions and associated systems. These formulations are designed to help:

• Maintain smooth and precise gear changes.
• Protect transmission components against wear.
• Resist oxidation and thermal breakdown.
• Support reliable operation over extended service periods.
• Meet relevant transmission manufacturer requirements.

Correct fluid selection is particularly important, as automatic, manual and specialist transmission systems can require significantly different formulations.

KOOL-GUARD Antifreeze and Coolants

The KOOL-GUARD range provides coolant and antifreeze solutions for commercial vehicles, automotive applications, plant and heavy-duty equipment.

The range includes IAT, OAT, NOAT and HOAT technologies, with both concentrated and ready-to-use formulations available. Products are designed to help maintain cooling-system efficiency, support temperature control and protect against corrosion, freezing and overheating.

Selected KOOL-GUARD products meet requirements associated with commercial vehicle and engine manufacturers including DAF, Cummins, MAN, Mercedes-Benz/Daimler Truck, Renault, Volvo and John Deere.

Hydraulic Lubricants for Commercial and Specialist Vehicles

Commercial vehicles fitted with hydraulic equipment require dependable fluids capable of maintaining pressure, flow and protection under changing loads and temperatures.

The ULTRA-HYD range includes:

• High-viscosity-index hydraulic fluids.
• Long-life mineral hydraulic oils.
• Zinc-free formulations.
• Fully synthetic hydraulic fluids.
• Detergent hydraulic oils.
• Fire-resistant products.
• Biodegradable and environmentally considerate options.

These products support applications including lifting equipment, mobile plant, vehicle-mounted hydraulic systems and machinery operating in demanding or environmentally sensitive locations.

Aerosols and Workshop Support Products

Rock Oil also supplies a practical range of maintenance aerosols and workshop products for commercial vehicle servicing and fleet maintenance.

The range includes products for:

• Brake and component cleaning.
• Degreasing.
• Penetrating lubrication.
• Corrosion protection.
• Anti-seize applications.
• Chain and cable lubrication.
• General workshop maintenance.

These products provide convenient support for routine servicing, component protection and day-to-day workshop operations.

Supporting Efficient Fleet Operation

Correct lubricant selection can contribute to more efficient and reliable fleet operation.

Depending on the product and application, Rock Oil lubricants can help support:

• Reduced friction and component wear.
• Improved lubricant stability under demanding conditions.
• Longer service intervals where authorised.
• Reduced lubricant consumption.
• Fewer maintenance-related disruptions.
• Extended component and equipment life.

The correct product should always be selected according to the vehicle manufacturer’s specification, operating conditions and service requirements.

Responsible Product Performance

Rock Oil is committed to developing lubricants that support efficient operation, dependable protection and responsible product use.

Long-life, extended-drain and low-ash technologies can help reduce lubricant consumption and maintenance requirements when correctly matched to the application. Specialist hydraulic options also include zinc-free and biodegradable formulations for vehicles operating in sensitive environments.

By choosing the correct products for each vehicle and system, fleet operators can help protect their equipment investment while reducing unnecessary waste and operational disruption.