Primrose Oil 513M Armor Plate with Moly-D

Primrose Oil 513M Armor Plate with Moly-D is a multi-grade gear oil that provides excellent lubrication for both the axle and transmission in summer and winter has long been desired by equipment manufacturers. The great success and public acceptance of multi-grade motor oils has emphasized the need for similar viscosity features in gear oils. The viscosity improvers that work so well in motor oils would shear out under the extreme pressures encountered in gears, resulting in severe viscosity loss.

Product Type: Lubricant

Application Area: Drivetrain, Gears, Hypoid Gear

Compatible Substrates & Surfaces: Brass, Copper, Metal

Features: Anti-Wear Properties, Corrosion Resistant, Excellent Lubricity, Extreme Pressure Performance, Good Thermal Stability, High Performance, Improved Shear Stability, Oxidation Resistant, Water Resistant

SAE Viscosity Grade: SAE 85W-140

Knowde Enhanced TDS

Identification & Functionality

Product Type

The XHP formulation of 513M is based on completely shear stable and thermally stable lubricant components and additive chemistry to give the necessary oxidation stability, rust protection, extreme pressure properties, and controlled chemical activity to meet full scale and laboratory tests required by the MIL-L-2105D specifications. This product contains dispersants and anti-oxidants which provide a level of thermal stability and deposit control not found in other GL-5 gear lubricants without sacrificing demulsibility. In addition, it contains a special adhesive/cohesive additive for more positive lubrication and a seal swell agent to condition seals and help reduce leakage.

Features & Benefits

Product Highlights

Armor Plate with Moly-D XHP 513M is the first, fully balanced multi-grade gear lubricant which provides superior shear stability and thermal stability, and protects critical drivetrain components at temperatures 100°F above the operating capability of conventional GL-5 gear lubricants. This gear lubricant suffers no significant viscosity loss even after 50,000 miles of operation in hypoid axles, and a wide operating temperature range is provided with its low temperature flow characteristics. 513M far exceeds the performance level most widely demanded by equipment manufacturers.

Applications & Uses

Compatible Substrates & Surfaces

Armor Plate with Moly-D XHP 513M is recommended for heavy duty hypoid and spiral bevel axles, manual transmissions, transfer cases or power dividers, limited slip differentials, automotive and industrial worm gears, and for axles using phosphate treated gears where MIL-L-2105D products are specified.


513M is designed for use where either SAE 90, 140, or 85W-140 weight gear lubricant is recommended. The SAE weight recommended for any particular piece of equipment is found in the owner’s manual or Check Chart.

This product will blend readily with any approved petroleum base gear lubricant of the same SAE weight; however, it delivers optimum performance when used exclusively in any gear box or application to which it is introduced.


SAE Viscosity Grade
Typical Properties
ValueUnitsTest Method / Conditions
SAE Viscosity85W-140
API Gravity26.1
Fire Point540.0°F
Viscosity (100°F)1632.0SUS
Viscosity (210°F)124.0SUS
Viscosity (40°F)352.0cStASTM D445
Viscosity Index103.0
Pour Point-5.0°F
Foam TestPass
Corrosion Test (3 hrs, 212°F)Pass
Timken Load Test55.0lbsASTM D2509

Technical Details & Test Data

Performance Characteristics

Armor Plate with Moly-D XHP 513M is a thermally stable, extra high performance automotive gear oil. Below are the superior features of the new XHP additives system:

  • GL-5+/MT-1
  • Superior Thermal Stability
  • Improved Corrosion Protection
  • Complete Shear Stability
  • Excellent Water Resistance
  • Extended Oil Seal Life
  • Increased Extreme Pressure Ratings
  • Exceptional Component Cleanliness
  • Reduced Operating Temperature
  • Reduced Wear
  • Exceeds all applicable military, industry, and equipment manufacturers’ performance standards.
  • Copper/Brass Compatibility

Packaging & Availability

Packaging Size
  • 35 Pounds
  • 50 Pounds
  • 120 Pounds
  • 260 Pounds
  • 420 Pounds
  • 2100 Pounds
  • Bulk