AMSOIL 100% SYNTHETIC CHAINCASE & GEAR OIL

Match it to the case

Put this oil in enclosed chains and gears, not in an engine, transmission, or open chain. Snowmobile chaincases, ATV gearcases, general equipment housings, and Arctic Cat Diamond Drive gearcases are the listed targets. That sealed case runs on one small fill, so the fluid has to fight rust, oxidation, foam, and water until the next service.

Treat the machine manual like the final call. A sled chaincase, a quad gearcase, and a Diamond Drive can sit under the same brand family and still use different fill points and capacities. Make sure the case asks for chaincase or gearcase fluid before you drain it.

Use the replacement list carefully

Cross-check the bottle you have been using. It replaces Arctic Cat Synthetic Chain Lube #4639-363 and Synthetic ACT Gearcase Fluid #5639-219, #4639-361, and #4639-628. It also replaces Ski-Doo and Can-Am XPS Mineral Chaincase Oil #415129500 plus XPS Synthetic Chaincase Oil #293600138 and #9779156.

Polaris SCL Synthetic Chaincase Lubricant #2872952, #2873105, and #2873106 are on the list too, and Yamaha is covered as a brand. A part number match gets you close, but do not skip the service chart. Year, model, and housing design decide the drain interval and the fill amount.

Read the cold and hot numbers

Kinematic viscosity is 68.6 cSt at 40°C and 10.3 cSt at 100°C under ASTM D445, with a 136 viscosity index under ASTM D2270. That tells you the oil thins in a controlled way as the case warms up, which matters when your first pull starts from a frozen trailer and ends under load.

Pour point is -46°C (-51°F) under ASTM D97. That is a lab flow number, not a promise that every machine is ready for that temperature, but it tells you the fill can move when cold. Thick, slow oil drags on the chain and steals power before the track or tires ever see it.

Flash point is 236°C (457°F), fire point is 260°C (500°F), and Noack evaporation loss is 5 percent by weight. Low evaporation helps the oil you drain look more like the oil you poured in, instead of losing the lighter fraction during hot service.

Skip ATF and automotive gear lube

Do not use automatic transmission fluid as a shortcut. ATF is a hydraulic fluid, and it does not bring the extreme-pressure additive package a chaincase needs. Loaded chain plates and gears then run without the layer that gives way before the metal does.

Do not swing the other way and pour in automotive gear lube either. Hypoid gear oil is built for a different gear set and runs too thick for powersports chain and gear lubrication. Poor circulation, extra drag, and avoidable wear are the result.

Drain, fill, and dispose

Change it at the machine manufacturer's interval. Synthetic oil does not automatically stretch a chaincase service, especially in a small sealed housing that can pick up water or wear metal. Warm the case if the procedure allows, drain it fully, and refill to the manual's capacity.

It is compatible with conventional and synthetic chaincase oils, so a small amount left behind will not react. Still, drain the old fluid completely at changeover so you get the performance you paid for. TCCCN-EA is the 16 oz. bottle, TCCCN-CA is the case of six, and TCC05-EA is the 5 gallon pail.

Wear gloves and keep the work area ventilated. The oil can cause mild skin irritation, can trigger an allergic skin reaction, and is harmful to aquatic life with long lasting effects. Put used oil and empty packaging into the right recycling or disposal stream, never into a drain.

Verified specifications