Product code CTG
AMSOIL SAE 10W 100% Synthetic Powershift Transmission Fluid
SAE 10W synthetic powershift fluid for heavy equipment
- SAE 10W synthetic powershift transmission fluid
- Supports wet brakes, clutches, and hydraulic control in equipment duty
- Resists heat and oxidation through long operating hours
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Product overview
Powershift transmissions in construction and mining equipment shift under load, and the same fluid usually runs the clutches, the wet brakes, and the hydraulics. AMSOIL SAE 10W Synthetic Powershift Transmission Fluid is the lightest of the three grades.
Reach for the 10W in cold climates or wherever the equipment manufacturer specifies a 10W. It carries the broadest specification coverage in the family and posts a 0.35 mm four-ball wear scar, the best result of the three grades.
What the formula does
- Compatible with common metallic and non-metallic friction materials, with stable friction properties that help eliminate brake noise and vibration.
- Non-slip friction properties help prevent clutch slippage, which is what causes glazing and friction-surface deposits.
- Oxidation and thermal stability hold off varnish, deposits, and sludge, and the fluid doubles as a heat-transfer fluid to help cool hot-running equipment.
- Guards against copper corrosion and rust, even during storage, and it does not foam in service.
Where this fluid fits
Use in equipment such as:
- Dozers, wheel loaders, and crawlers
- Backhoe loaders and road graders
- Cranes and off-road fork trucks
- Harbor-handling and railway equipment
- Mining equipment
- Heavy-duty manual transmissions
- Commercial marine applications
Cold-climate starts in the lightest powershift grade
AMSOIL SAE 10W Synthetic Powershift Transmission Fluid is the thinnest fluid in the powershift line at 7.1 cSt at 100°C and 41.9 cSt at 40°C, and it pours at -48°C (-54°F). In low temperatures it flows readily for dependable startup and post-startup protection, which is why cold-climate operations gravitate to this grade.
Climate alone does not decide the fill. Machines written for a heavier grade in the same yard take Powershift SAE 30, and reaching for a thinner fluid to make winter starts easier moves the sump away from the requirement the machine was built around.
Coverage changes when the grade changes
Specification coverage is not uniform across the three powershift grades, so a substitution is never a neutral swap. Dana Powershift Transmission service appears on the SAE 10W listing, while the CD-50 manual transmission requirement is carried by the heaviest grade instead. Some requirements run across all three grades and some sit on only one, so a machine written up against a particular requirement needs the grade that carries it. The specification list on this page shows what this grade covers, and the equipment documentation is where the requirement gets confirmed.
A 0.35 mm scar in the four-ball wear test
The four-ball wear test (ASTM D4172B at 40 kg, 75°C, 1200 rpm, one hour) measures the scar a rotating ball leaves on three stationary ones, and this grade produced a 0.35 mm result, the smallest of the three powershift fluids. For an operator uneasy about whether a light fill can carry gear and bearing loads, the lightest grade posting the smallest scar is useful context. A bench test is not a job site, so the grade the equipment manufacturer specifies still governs.
Powershift duty and hydrostatic duty are different jobs
This fluid family is formulated for powershift and manual transmissions, wet brakes, and final drives in equipment such as dozers, wheel loaders, crawlers, backhoe loaders, road graders, cranes, and mining machines. Heavy-duty manual transmissions, off-road fork trucks, harbor-handling and railway equipment, and commercial marine applications appear on the same list. A hydrostatic drive unit is a separate system with its own fluid requirement, served by 20W-50 Synthetic Hydrostatic Transmission Fluid. Match the product to the system named in the equipment manual rather than to the machine as a whole.
Specifications Powershift SAE 10W covers
The SAE 10W grade covers applications requiring any of the following:
- Allison C-4
- Caterpillar TO-4
- Dana Powershift Transmission
- Komatsu KES07.868.1
- ZF TE-ML 03C
Coverage as published in the AMSOIL data bulletin, checked July 2026. AMSOIL revises coverage when a formula changes, so confirm against AMSOIL's current data bulletin before ordering.
Service life
The formula provides extended service life beyond conventional petroleum fluids as long as it stays free of dirt and moisture.
Use oil analysis before extending service intervals beyond the equipment manufacturer's recommendation.
Good to know
- The powershift grades can be used in Caterpillar, Allison, Komatsu, Clark, Hurth, Borg-Warner, Twin Disc, Voith, ZF, Funk, and Brockhouse powershift-type transmissions, and in Eaton, Rockwell, and Fuller transmissions.
- Fully compatible with other TO-4 fluids used in powershift applications. To switch, drain the system, replace the filter if the equipment has one, and refill with the correct viscosity.
Typical technical properties
| SAE viscosity grade | 10W |
|---|---|
| Kinematic viscosity at 100°C (ASTM D445) | 7.1 cSt |
| Kinematic viscosity at 40°C (ASTM D445) | 41.9 cSt |
| Viscosity index (ASTM D2270) | 132 |
| Pour point (ASTM D97) | -48°C (-54°F) |
| Four-ball wear scar (ASTM D4172B) | 0.35 mm |
Typical properties published by AMSOIL, checked July 2026. These are representative values rather than a specification, and they change when AMSOIL updates a formula.
Package sizes and product codes
| Product code | Package size | Unit |
|---|---|---|
| CTG05-EA | 5 Gallon Pail | Each |
| CTG27-EA | 275 Gallon Tote | Each |
Select a product code to open that package size on the AMSOIL product page.
Product documents
AMSOIL publishes the full technical detail for this product in these documents.
Where to order
Confirm this formula is the match for the vehicle or equipment in the AMSOIL product guides, then order Powershift SAE 10W online. Existing members can sign in to apply the discount automatically.
Details and questions
Which equipment uses Powershift SAE 10W?
Dozers, wheel loaders, and crawlers, backhoe loaders and road graders, cranes and off-road fork trucks, harbor-handling and railway equipment, mining equipment, heavy-duty manual transmissions, and commercial marine applications.
Does the SAE 10W grade cover Caterpillar TO-4?
It is listed for applications requiring Allison C-4, Caterpillar TO-4, Dana Powershift Transmission, Komatsu KES07.868.1, and ZF TE-ML 03C, which is the broadest coverage of the three powershift grades.
Which powershift grade should be used?
Use the SAE grade the equipment manufacturer specifies. The 10W is the light grade for cold climates, Powershift SAE 30 is the middle grade for general equipment service, and Powershift SAE 50 is the heavy grade for high loads and high operating temperatures.
Can it be mixed with the TO-4 fluid already in the machine?
It is fully compatible with other TO-4 fluids used in powershift applications. To switch, drain the system, replace the filter if the equipment has one, and refill with the correct viscosity.
How long does the fluid last in service?
It provides extended service life beyond conventional petroleum fluids as long as it stays free of dirt and moisture. Use oil analysis before extending service intervals beyond the equipment manufacturer's recommendation.
Will it upset wet brakes or clutch engagement?
It is compatible with common metallic and non-metallic friction materials, with stable friction properties that help eliminate brake noise and vibration, and non-slip friction properties that help prevent clutch slippage. Order AMSOIL SAE 10W Synthetic Powershift Transmission Fluid online in 5 gallon pails or 275 gallon totes.