AMSOIL Synthetic Water-Resistant Grease

Use it where water keeps showing up

Pick this grease for fittings that see water, humidity, mud, snow, or ice on a regular basis. Boat trailer hubs get backed into the lake, ATV and side-by-side bearings cross creeks, snowmobile parts pack with snow, and marine hardware often sits damp long after the ride is over.

The fit still starts with the service chart. The component needs to accept an NLGI #2 GC or LB grease, then the wet-duty need points you to this blue formula. Rough riding by itself does not require WR grease if water is not part of the problem.

Trust the WR tag for wet work

WR is the water-resistance tag that sits on top of the NLGI HPM core specification. This grease carries GC-LB with HPM+WR, so it covers wheel-bearing and chassis service where water, humidity, or other high-moisture conditions keep attacking the grease film.

Water washout is 0.8 percent under ASTM D1264. The test sprays water at a packed bearing while it runs at temperature, then measures the grease loss. A low result tells you the grease stayed in place while water was hitting the housing.

Sprayoff matters too, especially around exposed pivots and washdown areas. This formula is built to hold together against standing and pressurized water, cling to the metal, and keep the protective film from leaving with the rinse water.

Protect bearings that sit wet

Repeated water contact starts rust fast once the grease film leaves the steel. This grease seals metal surfaces and uses corrosion-inhibitor chemistry to fight the damage from standing water, humid storage, and wet trail use.

It passes ASTM D1743 rust and corrosion testing. That method packs a tapered roller bearing, adds water, exposes the assembly to humidity, and checks the races afterward. For a trailer hub or powersports bearing that gets submerged, that result belongs near the top of your checklist.

Compare the load and heat specs

Four-ball weld point is 620 kgf under ASTM D2596, Timken OK Load is 65 lb. under ASTM D2509, and the ASTM D2266 four-ball wear scar is 0.42 mm. Those figures show the EP and wear package, while base oil viscosity is 170 cSt at 40°C.

Leakage is 2.3 g under ASTM D4290, and oil separation is 0 percent under ASTM D6184. The 0 percent oil separation number matters in wet service because the base oil stayed locked into the thickener during the test instead of bleeding out before the bearing needed it.

The operating range is -40°F to 350°F (-40°C to 177°C). Dropping point is above 600°F (316°C), high-temperature bearing life is 120 hours, and low-temperature torque is 8.7 N·m at -40°C. Use the operating range, not the dropping point, for service decisions.

Pack wet hubs the right way

Wipe the fitting clean, then grease to the amount your service procedure calls for. Keep housings one-third to one-half full unless the manual says otherwise. A full cavity churns grease and builds heat, and wet hubs already have enough working against them.

Do not rely on the grease gun to remove water or grit that slipped past a seal. Strip and repack submerged hubs on a schedule, especially after a season of boat ramps, creek crossings, or washdowns. That is how you clear the contamination instead of pushing fresh grease around it.

Clean out the old grease at changeover when you can. If not, flush with a liberal amount while the mechanism turns and watch the blue purge for consistency. GWRCR-EA is the 14 oz. cartridge, with cases of 10, packs of 40, 35 lb. lugs, and 120 lb. kegs available.

Verified specifications