AMSOIL DOMINATOR® Synthetic Racing Grease

Pack race parts that earn it

Use this grease on high-performance bearings and chassis components in racing machines, whether the day is on snow, dirt, water, or a prepared track. Race hubs see speed, heat, side load, braking heat, and washdown water in combinations that normal utility service may never see.

Slow-turning racing components count too. The formula is built to give low-speed parts heavy-duty load-bearing capacity, so pivots, spindles, and chassis points can qualify when their own spec calls for NLGI Grade 2 consistency and GC-LB service.

Check it against GC-LB

GC-LB is the service classification for wheel-bearing and chassis grease. Worked penetration under ASTM D217 runs 265 to 295, while the GC-LB window allows 220 to 340. That places this grease in the middle of the consistency range for the rating.

Some published lines are descriptive rather than pass-fail requirements. Thickener type, consistency grade, operating range, and Timken OK Load tell you what the product is, but the GC-LB classification does not set a required value for each of those entries.

Use the rating as the first gate, then use the racing specs to decide whether it is worth stepping up. If your part only asks for Grade 2 GC-LB and never sees race heat or washout, a general grease may be enough. If the hub is punished every weekend, the extra margin matters.

Respect the heat ceiling

Dropping point is 318°C (605°F) under ASTM D566, against a 220°C (428°F) GC-LB minimum. That test heats the grease until the thickener releases enough oil for the first drop to fall, so it measures thickener stability rather than the approved running temperature.

High-temperature bearing life is 220 hours under ASTM D3527, against an 80-hour minimum. The test spins a packed bearing hot until torque rises past the limit, so this number speaks to endurance under heat, not just a single flash of temperature.

The operating range still ends at 177°C (350°F). Plan service around that ceiling. The 605°F dropping point tells you the thickener has margin, but it does not turn a wheel bearing into a 605°F continuous-duty part.

Look at load, water, and cold starts

Four-ball weld point is 500 kgf under ASTM D2596, with a load wear index of 62 and a four-ball wear scar of 0.42 mm under ASTM D2266. Timken OK Load is 60 lb. under ASTM D2509. Those numbers show the EP and anti-wear package behind the racing label.

Water washout is 0.5 percent at 79°C (175°F) under ASTM D1264, well below the 15 percent GC-LB cap. Oil separation is 0.2 percent under ASTM D1742, leakage is 4.0 g under ASTM D4290, and the grease passes ASTM D1743 rust and corrosion testing.

Low-temperature torque is 2.5 at -40°F against a 15.5 maximum, and the operating range starts at -40°C (-40°F). That matters in a cold pit or trailer, where the grease still needs to pump through a gun and let the bearing turn cleanly before the first session.

Service it like race grease

Clean every fitting before the coupler touches it. Dirt from the track is the enemy, and a grease gun can push grit into the housing as easily as it pushes grease. Keep bearing housings one-third to one-half full so the grease has room to move without churning.

Strip and repack on a schedule tied to the component and the track conditions. A wet, sandy race weekend deserves a teardown sooner than a clean dry day. Fresh grease cannot remove water, sand, or overheated residue if the housing never comes apart.

It is compatible with many other greases, but clean changeover is still the better job. If you must flush, use a liberal amount while the mechanism turns and monitor the purge. GRGCR-EA is the 14 oz. cartridge, GRGCR-CA is the case of 10, and GRGCR-PK is the pack of 40. This product carries a California Proposition 65 warning.

Verified specifications