OZ 6521 – Heavy-Duty Diesel Engine Oil Additive Package (API CD, TBN 11)

Cost-Effective Additive Package for High-TBN Diesel and Gearbox Applications

Description:
OZ 6521 is a minimum treat-rate, cost-effective additive package designed to meet API CD performance standards with a Total Base Number (TBN) of 11. It also meets U.S. military performance requirements for lubricants used in combined engine and gearbox applications.

Engineered for use with Group I mineral base oils, OZ 6521 delivers the high alkalinity necessary to protect diesel engines operating with high-sulfur fuels—particularly those exceeding the 25 ppm sulfur limit common in European fuel standards. The additive is especially suitable for heavy-duty diesel applications, offering both engine protection and gearbox lubrication within a single oil formulation.

Key Features:

• Meets API CD and military-grade combined engine/gear oil requirements

• Delivers high TBN (11) for effective acid neutralization in high-sulfur fuel environments

• Designed for use with traditional Group I base stocks

• Provides excellent wear protection, detergency, and oxidation stability

• Suitable for combined engine and gear lubrication

• Cost-effective solution for low and mid-tier diesel applications

Applications:

• Heavy-duty diesel engines in commercial and industrial equipment

• Lubrication of combined engine-gear systems

• Ideal for older fleets operating in regions with high-sulfur diesel fuel

• Suitable for blending monograde and multigrade diesel engine oils

Formulation Guidelines:

• Blend with mineral base oil, pour point depressant, and optionally a viscosity modifier for multigrade oils

• Follow standard blending procedures for additive incorporation and temperature control

Handling and Safety Considerations:

• Avoid contact with water and wet gas during storage and handling

• Do not expose to direct air contact when heated, as it may cause discoloration

• To prevent ZDDP decomposition, avoid overheating—especially during mixing

• Heating above 140°F (60°C) is permitted short-term, but long-term storage should not exceed 100°F (40°C)

• Decomposition may release hydrogen sulfide, mercaptans, and olefins, requiring adequate ventilation

Packaging & Storage:

• Supplied in 200-liter metal drums, IBC totes, or bulk containers

• Store in dry, clean, and well-ventilated warehouses away from direct sunlight and moisture

• Handle using standard lubricant additive practices