AMSOIL Synthetic Powershift Transmission Fluid is specifically designed for high-torque, heavy-duty powershift transmissions. Formulated for extended drain intervals, Powershift Transmission Fluid contains top-quality synthetic base oils and a high level of top-quality additives selected specifically for powershift transmissions. It offers exceptional transmission friction performance, smooth brake operation, gear and bearing wear protection and maximum equipment life.
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Product data sheets
View, download, or save a copy of the Product Data Sheet or Safety Data Sheet for AMSOIL SAE 10W 100% Synthetic Powershift Transmission Fluid.
AMSOIL SAE 10W Synthetic Powershift Transmission Fluid (CTG) is the light-viscosity grade in the AMSOIL Powershift family, built for off-road powershift transmissions, wet brakes, final drives and hydraulic systems in heavy equipment running in cold climates or arctic conditions. The 100% synthetic formulation is engineered around the Caterpillar TO-4 frictional and wear requirements and pairs that performance with a pour point that supports cold-start flow and dependable low-temperature service.
Stable friction for clutch and wet-brake control
SAE 10W Synthetic Powershift Transmission Fluid is compatible with common metallic and non-metallic friction materials. Stable frictional characteristics help eliminate excessive brake noise and vibration in oil-immersed brake systems, and non-slip friction properties are designed to prevent clutch slippage that can cause glazing, friction-surface deposits, and material degradation. Calibrated to the Caterpillar TO-4 friction requirements, the fluid delivers responsive yet smooth clutch engagement and consistent power transmission through clutches and synchronizers across the full duty cycle.
Shear-stable wear protection under sustained torque
SAE 10W Synthetic Powershift Transmission Fluid meets the wear and frictional requirements of the Caterpillar TO-4 specification and is formulated for superior shear stability so the 10W grade stays in grade through its service life. That stability supports long-term protection against gear, bearing and clutch wear in equipment subjected to high, sustained torque, such as dozers, wheel loaders, motor graders, and mining machines. Four-Ball Wear Test results for the CTG grade are 0.35 mm scar diameter (ASTM D4172B, 40 kg, 75 degrees Celsius, 1,200 rpm, one hour).
Cold-flow performance for arctic and winter operation
The 10W viscosity is the cold-climate option in the Powershift family. SAE 10W Synthetic Powershift Transmission Fluid carries a pour point of minus 48 degrees Celsius (minus 54 degrees Fahrenheit) per ASTM D97 and a viscosity index of 132 per ASTM D2270, so the fluid flows readily in cold transmissions, hydraulic systems and final drives for dependable startup and post-startup protection.
High-temperature stability for hot-running equipment
In high temperatures, the synthetic base chemistry resists oxidation and thermal breakdown that drive varnish, sludge and deposit formation in heavily loaded powershift transmissions. The 10W grade functions as a heat-transfer fluid and helps cool hot-running equipment, and a Flash Point of 248 degrees Celsius (478 degrees Fahrenheit) per ASTM D92 reflects the resistance of the formulation to high-temperature volatility losses.
Corrosion, rust and foam control during use and storage
SAE 10W Synthetic Powershift Transmission Fluid protects yellow-metal components from copper corrosion and steel components from rust, including periods of equipment storage between shifts or seasons. The additive package controls foam in service so loaded components stay separated by lubricant film and do not run through dry contact under high torque.
Recommended applications and service intervals
SAE 10W Synthetic Powershift Transmission Fluid (CTG) is recommended for off-highway powershift transmissions, wet-brake systems, final drives, and hydraulic systems that call for a TO-4 grade in the 10W viscosity. Equipment manufacturer service intervals govern. To match a specific make, model and year to the right viscosity and the right AMSOIL product, work through the AMSOIL vehicle lookup guide.
Cold-climate and arctic operation of dozers, wheel loaders, crawlers, backhoe loaders, cranes, off-road fork trucks, harbor-handling equipment, railway equipment, mining equipment, road graders, and commercial marine applications.
Powershift-type transmissions from Caterpillar, Allison, Komatsu, Clark, Hurth, Borg-Warner, Twin Disc, Voith, ZF, Funk and Brockhouse, plus Eaton, Rockwell and Fuller transmissions where a TO-4 10W is specified.
Service life beyond conventional petroleum fluid is supported when the fluid is kept free of dirt and moisture; oil analysis is recommended when extending intervals beyond equipment manufacturer recommendations.
CD-50 manual transmission service interval published with the Powershift family is up to 60,000 miles or one year, whichever comes first, in CD-50 manual transmission applications or as specified by the OEM. CD-50 service applies to the SAE 50 grade in the Powershift line, not to this 10W grade.
SAE 10W Synthetic Powershift Transmission Fluid is fully compatible with other TO-4 fluids used in powershift applications. To install, drain the existing fluid, replace the filter if equipped and refill with the appropriate viscosity of AMSOIL Synthetic Powershift Transmission Fluid. Aftermarket additives are not required.
Typical technical properties
Property
Value
SAE viscosity grade
10W
Kinematic viscosity at 100 degrees Celsius, cSt (ASTM D445)
7.1
Kinematic viscosity at 40 degrees Celsius, cSt (ASTM D445)
41.9
Viscosity index (ASTM D2270)
132
Flash point, degrees Celsius (degrees Fahrenheit) (ASTM D92)
248 (478)
Fire point, degrees Celsius (degrees Fahrenheit) (ASTM D92)
246 (475)
Pour point, degrees Celsius (degrees Fahrenheit) (ASTM D97)
-48 (-54)
Four-Ball Wear Test scar, mm (ASTM D4172B, 40 kg, 75 degrees Celsius, 1,200 rpm, one hour)
0.35
Performance specifications
Allison C-4, Caterpillar TO-4, Dana Powershift Transmission, Komatsu KES 07.868.1, ZF TE-ML 03C
Order AMSOIL SAE 10W 100% Synthetic Powershift Transmission Fluid
AMSOIL SAE 10W 100% Synthetic Powershift Transmission Fluid is stocked in 5-gallon pail (CTG05-EA) and 275-gallon tote (CTG27-EA) sizes through this authorized AMSOIL dealer. AMSOIL products are backed by the AMSOIL Limited Warranty. Match equipment application match with the AMSOIL vehicle lookup guide and compare the AMSOIL transmission fluid lineup in the AMSOIL ATF guide before placing an order. Order Now.
I have been using this product in the rear end of my 1971 Flextrack Nodwell snow cat for over ten years. It performs well with wet brakes and keeps the gear box well protected and cool.
By Aj from Jackson hole on January 29, 2026.
Would recommend this to a friend.
Best transmission in oil by far.
I use this in all of our manual transmissions and so far I like what see smoother shifts. The guys are very hard on the trucks so I want the best in them.
By John from Marlboro nj on June 23, 2025.
Would recommend this to a friend.
Never disappoints
Was doing a clutch on a Eaton 13 speed and decided to replace the oil not knowing the status of the oil that was in the transmission. Oil looked fine but replaced anyway and so glad I did because it actually shifts so much smoother now. I love amsoil products and they will never let you down!
What is a Caterpillar TO-4 fluid and how is it different from automatic transmission fluid?
Caterpillar TO-4 is an off-highway powershift transmission and drivetrain fluid specification covering frictional performance, wear protection and oxidation control for transmissions, wet brakes, final drives and hydraulic systems in heavy equipment. It is not a Dexron or Mercon automatic transmission fluid spec, and TO-4 fluids are not a substitute for ATF in highway passenger vehicles. SAE 10W Synthetic Powershift Transmission Fluid meets the TO-4 requirements in the 10W viscosity grade.
When should the SAE 10W grade be chosen instead of SAE 30 or SAE 50 Powershift Transmission Fluid?
Viscosity selection follows the equipment manufacturer's recommendation for ambient temperature and duty cycle. The SAE 10W grade is the cold-climate option in the AMSOIL Powershift family and is appropriate where the OEM calls for a TO-4 10W or where low ambient temperatures and arctic operation require a fluid that retains pumpability during cold starts. SAE 30 and SAE 50 grades cover warmer ambient ranges and applications such as CD-50 manual transmissions for the SAE 50 grade.
Can SAE 10W Synthetic Powershift Transmission Fluid be mixed with other TO-4 fluids?
The fluid is fully compatible with other TO-4 fluids used in powershift applications. Field top-offs with a comparable TO-4 fluid do not damage the lubricant, although a complete drain and refill is preferred to realize the full performance of the synthetic formulation. Replace the filter, if equipped, during a fluid change.
Does this fluid work in oil-cooled wet-brake systems used in dozers and loaders?
SAE 10W Synthetic Powershift Transmission Fluid is calibrated to the Caterpillar TO-4 friction requirements and is compatible with common metallic and non-metallic friction materials in oil-immersed brake assemblies. Stable frictional characteristics help eliminate excessive brake noise and vibration in wet-brake service, and foam control supports consistent hydraulic response and braking feel.
How cold can SAE 10W Synthetic Powershift Transmission Fluid run before it stops pumping?
The CTG grade carries a pour point of minus 48 degrees Celsius (minus 54 degrees Fahrenheit) per ASTM D97, the value that drives selection of this grade for cold-climate and arctic off-highway operation. The equipment manufacturer's minimum starting temperature for the transmission and hydraulic systems still governs cold-start procedure.
How is service life determined for off-road powershift transmissions running this fluid?
Service intervals for off-highway equipment are set by the equipment manufacturer based on hours of operation, load, and duty cycle. SAE 10W Synthetic Powershift Transmission Fluid provides extended service life beyond conventional petroleum fluids when the lubricant is kept free of dirt and moisture, and oil analysis is the recommended path to extending intervals beyond the OEM recommendation. The 60,000-mile or one-year service window published with the Powershift family applies to CD-50 manual transmission applications and the SAE 50 grade rather than the SAE 10W grade.
Does running AMSOIL Synthetic Powershift Transmission Fluid void an equipment warranty?
No. Use of AMSOIL synthetic lubricants in accordance with the equipment manufacturer's viscosity and specification requirements does not void an OEM warranty under United States Magnuson-Moss Warranty Act protections. AMSOIL products are also backed by the AMSOIL Limited Warranty. Match the right product with the AMSOIL vehicle lookup guide before placing the first order for new equipment.
