AMSOIL Synthetic High-Viscosity Lithium-Complex Grease

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AMSOIL Synthetic High-Viscosity Lithium-Complex Grease

AMSOIL Synthetic High-Viscosity Lithium-Complex Grease is an NLGI #2, lithium-complex-thickened industrial grease built on premium ISO 320 synthetic base oils. The thick film, high dropping point, and shear-stable structure target slow-speed, heavily loaded service: industrial bearings, conveyor and crusher journals, agricultural drives, paper-mill and steel-mill rolls, mining pins, and shock-loaded off-road chassis points exposed to water, dirt, and heat.

Extreme-pressure film for slow, heavily loaded bearings

The formula carries an ASTM D2596 Four-Ball EP weld point of 315 kg and an ASTM D2266 Four-Ball wear scar of 0.39 mm. That combination is engineered for sliding, shock-loaded, and slow-rotating contacts where lighter chassis greases run thin: large pin bearings, journal bearings on conveyors and crushers, slow-turning shafts on agricultural drives, and fifth-wheel-grade duty points where load is high and rotational speed is low.

High dropping point for sustained high-temperature service

The lithium-complex thickener carries an ASTM D2265 dropping point of 267 C (513 F), well above the operating envelope most bearings will ever see. Continuous service is supported up to 177 C (350 F) with intermittent excursions to 204 C (400 F), giving installers headroom on hot-running paper-mill rolls, kiln components, dryer-section bearings, and chassis points sitting in radiant heat from exhaust or process equipment.

Stays in place under water washout and centrifugal load

Cohesion and adhesion additives anchor the grease film to metal. ASTM D1264 Water Washout returns 4.0 percent loss, ASTM D1742 Oil Separation returns 0 percent weight loss, and the grease holds worked penetration of 266 (ASTM D217) inside the NLGI #2 band. Slow-moving conveyors that wash down between shifts, agricultural equipment crossing wet fields, and outdoor construction iron all benefit from a grease that resists rinse-off and stays packed in the housing instead of spinning out.

Oxidation and corrosion protection for long re-grease intervals

A robust package of oxidation inhibitors slows thermal hardening and varnish formation, which is what causes ordinary multi-purpose greases to stiffen inside hot bearings and force early purges. Corrosion control is verified at ASTM D4048 Copper Corrosion 1A and ASTM D1743 Rust Prevention Pass, so bronze cages, copper bushings, and steel races stay protected when equipment sits idle between shifts or seasons. The shear-stable synthetic structure keeps consistency and base oil viscosity intact in the presence of mechanical activity.

Cold-temperature pumpability for outdoor and off-road work

Low-temperature torque numbers in ASTM D1478 at minus 20 C come in at 1,500 g-cm starting and 250 g-cm running, which keeps the grease pumpable through centralized lubrication lines and meterable from a hand or air-powered gun on cold mornings. The ISO 320 synthetic base oils hold a measured 295 cSt at 40 C (ASTM D445), so the film thickens correctly as load and temperature rise without losing flow during start-up.

Recommended applications and service intervals

AMSOIL Synthetic High-Viscosity Lithium-Complex Grease is engineered for heavy-duty industrial and off-road service where equipment sees adverse conditions, including environmental exposure, slow heavily loaded rotation, and shock loading. Re-grease intervals follow the equipment manufacturer's schedule; the high dropping point, ISO 320 base oil, and zero oil separation support extending those intervals under stable temperatures while staying inside the OEM-listed grease specification. Confirm equipment application match using the vehicle lookup guide.

• Heavy-duty industrial bearings, journal bearings, and pin joints operating under slow, heavy, or shock loads.
• Off-road and agricultural equipment exposed to water, dirt, heat, and intermittent service.
• Hot-running chassis points and bearing housings near exhaust, brakes, or process heat up to 177 C (350 F) continuous and 204 C (400 F) intermittent.
• Not formulated for food-contact applications; an H1 or H2 NSF-registered grease is required where incidental food contact is possible.

Pair re-lubrication with clean fittings, wiped zerks, and bearing housings kept one-third to one-half full of fresh grease to avoid over-pack heat buildup. When transitioning from another grease, purge the housing with fresh product while the mechanism is running and monitor for inconsistencies; compatibility with most lithium, lithium-complex, and many other thickener systems is expected, but verify under load before extending the new interval. Select the right cartridge, lug, or keg size in the grease guide.

Typical technical properties

Order AMSOIL Synthetic High-Viscosity Lithium-Complex Grease

Available sizes ship in 14-oz. cartridges (single, case of 10, or packs of 40), 35-lb. lugs, and 120-lb. kegs. Every container is backed by the AMSOIL Limited Liability Warranty. Use the grease guide for grade and application guidance before ordering. Buy online.

Frequently asked questions

What is lithium-complex grease and how is it different from ordinary lithium grease?

Lithium-complex grease uses a thickener formed by reacting lithium hydroxide with two acids instead of one. The resulting soap fiber structure gives a noticeably higher dropping point and better high-temperature performance than ordinary lithium-soap grease, which is why lithium-complex chemistry has become the default choice for industrial bearings and hot-running chassis points. AMSOIL Synthetic High-Viscosity Lithium-Complex Grease combines that thickener with ISO 320 synthetic base oils and a heavy EP additive package, aimed at the heaviest end of NLGI #2 service.

What does NLGI #2 mean and is it the right consistency for industrial bearings?

NLGI #2 is a consistency rating, not a viscosity. It corresponds to a worked penetration of 265 to 295, the buttery-but-firm consistency most centralized lubrication systems, grease guns, and bearing housings are designed around. This grease measures 266 worked penetration (ASTM D217), placing it squarely in the NLGI #2 band. Most industrial bearing OEMs specify NLGI #2 unless ambient cold or long pumping distance forces a step down to NLGI #1.

How hot can this grease run before it loses film strength?

The ASTM D2265 dropping point is 267 C (513 F), the temperature at which the thickener releases its base oil. Practical service runs well below that figure: continuous operation up to 177 C (350 F), with intermittent excursions to 204 C (400 F). For sustained operation above the continuous limit, a grease specifically rated for that temperature range is required.

Is this grease compatible with the lithium-complex grease already in the bearing?

The synthetic formula is compatible with most lithium and lithium-complex greases and many other thickener families. The recommended practice when switching is to flush the equipment while running with a liberal amount of fresh product, then watch for any change in consistency, color streaking, or operating temperature. Mixing thickener chemistries from incompatible families, such as polyurea with lithium-complex, can soften or harden the grease in service. When the previous thickener is unknown, purge the housing first.

Will it hold up to washdown and wet operating conditions?

Water washout loss at ASTM D1264 measures 4.0 percent, with oil separation at 0 percent weight loss (ASTM D1742). Combined with strong cohesion and adhesion additives, the grease resists rinse-off from spray, rain, and submerged conditions far better than typical multi-purpose lithium products, and it holds its base oil inside the soap fiber rather than bleeding out under heat.

What package sizes are available?

Production ships in 14-oz. cartridges (sold individually, in a case of 10, or in 40-packs), 35-lb. lugs, and 120-lb. kegs. Cartridges fit any standard grease gun, the 35-lb. lug feeds bulk filler pumps for shops servicing multiple machines, and the 120-lb. keg is the volume choice for fleet maintenance and centralized lubrication tanks.

Does the AMSOIL warranty apply to industrial and off-road use?

The product is backed by the AMSOIL Limited Liability Warranty. Coverage applies when the grease is installed in the applications and at the intervals specified by the equipment manufacturer and the published warranty terms. Keep purchase records and document each re-grease as part of the equipment maintenance file.