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Synthetic Heavy-Duty Grease

Synthetic GH Series Heavy-Duty EP Grease

Extreme-pressure, moly-fortified. Provides outstanding protection for four wheel drive steering knuckles, spring shackles and other components operating in high-load, low-speed conditions. Product Code: GHB, GHD


AMSOIL GH Series Extreme Pressure greases are qualified against the highest grease standard, NLGI GC (wheel bearing) and LB (chassis), and are designed for heavy duty applications. These greases are composed of synthetic base oils and lithium-complex thickeners that provide the film strength, shear resistance, and mechanical stability critical to high load protection. This combination excels in high and low operating temperature ranges by providing excellent oxidation stability, high temperature dropping points, good low temperature torque values and good low temperature pumping capabilities. The GH Greases are compounded with oxidation and corrosion inhibitors, effective oil soluble EP additives and molybdenum disulfide (moly) solid EP additives for all around protection in severe conditions.

The presence of moly provides an extra measure of protection in shock loading situations common in both construction and agricultural use. During heavy shock loading, the lubricant film between metal surfaces can be temporarily ruptured, but moly remains intact to prevent metal to metal contact which could cause equipment damage. Moly also assists in dirty environments or when proper re-greasing intervals are not followed.

AMSOIL's top performing lithium complex thickener system provides excellent water resistance as identified by the ASTM D-1264 water washout test. Therefore, even in wet conditions a lubricant film remains present to protect equipment against wear while the corrosion inhibitors prevent rust. AMSOIL GH greases adhere to metal and are shear stable during severe mechanical activity. These features mean the grease does not thin during operation, but rather it maintains its consistency and stays in place to provide good lubrication.


  • Moly Fortified for added EP protection
  • Adhesive and Shear Stable - prevents squeeze out
  • High dropping point (exceeds 500ºF)
  • Excellent water-washout resistance
  • Oxidation and corrosion inhibited


  • GHB (#1) & GHD (#2) ASTM D-4950 (NLGI) Service GC/LB
  • GHB (#1) Cincinnati Milicron P-72 Spec.
  • GHD (#2) Cincinnati Milicron P-62 Spec.
  • GHD (#2) Mack MG-C


AMSOIL GH Greases in grades #1 and #2 are recommended for use in manual or automatic lubricating systems. NLGI #1 (GHB) greases have better mobility and are the preferred choice for colder applications, for automatic lubrication systems with long pumping runs, and for gear box applications (where recommended by manufacturer). NLGI #2 (GHD) is the preferred choice for medium to high ambient temperatures, sleeve type bushings, high shock loading environments, high water environments, and is the primary choice for wheel bearings.

The correct consistency grade of AMSOIL GH EP Moly Greases are recommended for use in heavy and light duty applications found in manufacturing plants, automotive applications, agricultural equipment and construction equipment. These include, but are not limited to, roller bearings, plain bearings, gears, bushings, thrust bearings, wheel bearings, chassis lubrication, universal joints, ball joints, tie-rod ends, steering knuckles, and heavily loaded pivot pins on mining and off road equipment such as power shovels, draglines, wheel and back hoe loaders, excavators and bulldozers. AMSOIL GH greases are suitable for use up to 325º F continuous operation and 350º F intermittent service. When operating at elevated temperatures, frequent regreasing may be required.

AMSOIL GH Lithium Complex Greases are compatible with many other types of grease. However, it is recommended that when changing greases, the equipment be cleaned of the old grease when possible or flushed with a liberal amount of the GL grease while the mechanism is in operation. Closely monitor the system for any inconsistencies. Any grease compatibility questions should be referred to your AMSOIL representative or AMSOIL INC.


Synthetic GH Series Heavy-Duty EP Grease GHB GHD NLGI GC/LB
Thickener lithium complex lithium complex NR*
Fortified with moly compound yes yes NR*
NLGI Consistency Grade 1 2 NR*
NLGI Pertormance Grade GC-LB GC-LB NR*
Penetration ASIM D-217 (25ºC (77ºF), 0.1 mm)  Worked 60 strokes 310-340 265-295 220-340
Dropping Point, ºF ASTM D-2265 500 550 428
High Temperature Life ASTM D-3527 112 hrs. 118 hrs. 80 hrs.
Oxidation Stability - ASTM D-942 5 psi, max 2.4 psi, max NR*
Water Washout-ASTM D-1264 19.2% 1.6% 15.0%
Rust & Corrosion- ASTM D-1743 pass pass pass
Oil Separation-ASTM D1742 24 hrs., 25ºC (77ºF), % loss 3.3 2.1 6.0
Bearing Leak Test ASTM D-1 263 6 hrs., 600 rpm, 104ºC (220ºF), g lost <6 <1 NR*
Leakage (ASTM D-4290), g 7.8 1.0 10 max
Four Ball Wear Test ASTM D-2266 0.40 0.40 0.60
Fretting Wear (ASTM D-4170) Mg 3.5 3.4 10 max
Four Ball EP ASTM D-2596 Weld Point, kgt 400 400 200
Four Ball EP ASTM D-2596 Load Wear Index, kgf 65 68 30
Timken OK Load Test -ASTM D-2509, lbs 70 70 NR*
Low Temperature Torque - ASTM D-4693 N-m, -40ºC (-40ºF) 0.50 5.3 15.5
LT-37 Pumpability, 60ºF 750 g/min. 350 g/min. NR*
Copper Corrosion - ASTM D-4048 1B 1B NR*
Meets Disc Brake Wheel Bearing Specification: Ford ESA-MiC 198-A NA Yes NR*
Meets Disc Brake Wheel Bearing Specification: GM6031-M Yes Yes NR*
Meets Disc Brake Wheel Bearing Specification: Chrysler MS-3701 NA Yes NR*
Oil Viscosity 40ºC 130 cSt 130 cSt NR*
Oil Viscosity 100ºCV 16.5 cSt 16.5 cSt NR*
Flash Point - ASTM D-92 450 450 NR*
Fire Point - ASTM D-97 480 485 NR*
Color Purp/Blk Purp/Blk NR*
Texture Smooth Smooth NR*
*NR: Not required for NLGI GC/LB labeling.


Maintaining a clean work environment is important when equipment greasing is performed. Wipe grease fittings clean prior to injecting grease to prevent contaminant ingestion. Maintain bearing housings one-third to one-half full of grease. Do not over-grease as excessive heat buildup can result. Supplement standard grease maintenance by periodically cleaning and packing housings with fresh grease on an established maintenance schedule.


AMSOIL Industrial Lubricants are formulated to meet or exceed accepted industry specifications. AMSOIL warrants that the use of its lubricants will not cause mechanical damage to any mechanically sound equipment when AMSOIL products are used in full compliance with the companyÕs recommendations. However, the purchaser of these lubricants is responsible for determining if these specifications are adequate and proper for the intended application. The AMSOIL warranty is limited to lubricant performance consistent with indicated specifications. No additional warranty, expressed or implied, can be made.


AMSOIL GH Series Greases are available in 14-oz. cartridges, 16-oz. tubs (GHD only), 35-lb. pails, 120-lb. kegs and 400-lb. drums.

AMSOIL Industrial Lubricants are stocked in Superior, Wisconsin and in select regional distribution centers throughout the United States and Canada. AMSOIL will stock additional quantities of lubricants or special order products based on customer requests and regional demands.

If you want to buy AMSOIL products, visit the AMSOIL Online Store.