Tractor Hydraulic Fluid vs Transmission Fluid: Which One Should You Buy?
Tractor hydraulic fluid and transmission fluid compared on systems covered, compatibility, sizes and change intervals, with examples from each side.
On this page
Top picks at a glance
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- 1
Mobil Mobilfluid 424 Tractor Hydraulic Fluid9.5/10View on Amazon - 2
TRIAX Trans-Zero 20W-50 Full Synthetic Hydrostatic9.5/10View on Amazon - 3
STARFIRE Premium Tractor Hydraulic Fluid9.5/10View on Amazon - 4
Mobil Delvac Tractor Hydraulic Fluid 5 gal PailView on Amazon - 5
Duragard Synthetic Blend Universal Hydraulic Tractor FluidView on Amazon - 6
CAM2 Promax J20-C Tractor Hydraulic FluidView on Amazon - 7
Castrol Transmax ATF/CVT Universal Automatic TransmissionView on Amazon - 8
Buyers ProductsView on Amazon
Verdict: Choose a universal multi-system fluid, such as the TRIAX example, if your shed serves mixed makes and you want one fluid for several systems in a large pail. Choose a maker-specific fluid, such as the Kubota or Deere examples, if your manual names that maker’s fluid or part.
A tractor that shares fluid between hydraulics, transmission, wet brakes and final drives leaves little room for a wrong fill. The manual names the fluid the maker approves, while the shelf holds universal fluids beside maker-specific bottles. This comparison covers tractor hydraulic fluid vs transmission fluid, what each side lists for the systems it serves, and which side fits a mixed fleet or a machine kept to its maker’s fluid.
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TRIAX Agra UTTO Supreme Trans-Hydraulic Fluid
A full synthetic trans-hydraulic fluid in a 5-gallon pail, listed for transmissions, final drives, wet brakes, differentials and hydraulics across many tractor makes, with a drain interval the maker puts past 6,000 hours.
Who it's for: owners running mixed makes who want a multi-system fluid in a large pail.
Who should skip it: anyone whose manual names a fluid or spec the TRIAX listing does not claim, or who needs a smaller bottle for a top-off.
Read the full review
The TRIAX listing describes a full synthetic trans-hydraulic fluid for transmissions, final drives, wet brakes, differentials and hydraulics, listed at SAE 80 (ISO 32/46) viscosity and a GL-4 standard. The maker claims compatibility with John Deere J20C, Kubota UDT2, Case HyTran and other OEM specs, instant power transfer, rapid heat dissipation, zero foaming and a drain interval past 6,000 hours, with red dye for leak detection and level checks.
Pros
- Full synthetic formula listing SAE 80 (ISO 32/46) viscosity and a GL-4 standard
- Covers transmissions, final drives, wet brakes, differentials and hydraulics
- Maker lists compatibility with John Deere J20C, Kubota UDT2 and Case HyTran specs
- Red dye helps spot leaks and check the level
Cons
- Warranty term is not stated on the listing
- Only a 5-gallon size is listed
- Long compatibility list still needs a manual check for your model
- SAE 80 (ISO 32/46) grade must match what your manual names
Kubota Super UDT2 Trans-Hydraulic Fluid
A maker fluid for Kubota hydraulic, final drive, transmission, differential and wet brake systems, listed for improved performance and protection at extreme temperatures with smoother start-off and PTO connection.
Who it's for: Kubota owners who want the maker fluid for every system the listing names.
Who should skip it: anyone running other makes, since the listing names Kubota equipment.
Read the full review
The Kubota listing describes a multi-purpose fluid for hydraulic, final drive, transmission, differential and wet brake systems in Kubota equipment. The maker lists improved transmission performance and protection at extreme temperatures, smoother start-off, drive control and PTO connection, corrosion resistance and efficient filterability, plus reduced power loss for improved transmission efficiency.
Pros
- Made for Kubota hydraulic, transmission, differential and wet brake systems
- Listed for improved performance at extreme temperatures
- Smoother start-off, drive control and PTO connection
- Corrosion resistance with efficient filterability
Cons
- Warranty is not stated on the listing
- Weight is not stated
- Only a 1-gallon size is listed
- Kubota equipment only, not a universal fluid
Mobil Fluid 424 Tractor Hydraulic Fluid
A tractor hydraulic fluid in a 5-gallon pail, weighing 38.0 pounds. The listing gives no bullets, so systems beyond the hydraulic naming in its title, viscosity and compatibility are not stated.
Who it's for: owners who already know Mobil Fluid 424 fits their machine and want a 5-gallon pail.
Who should skip it: anyone who needs stated systems, viscosity or compatibility before buying.
Read the full review
The Mobil listing is thin: a title naming a tractor hydraulic fluid in a 5-gallon pail, a spec table listing 38.0 pounds and part number 100978, and no bullets. With no systems beyond its title naming, and no viscosity, compatibility or drain interval stated, the listing leaves the key buying questions open.
Pros
- 5-gallon pail size
- Item weight listed at 38.0 pounds
- Part number 100978 stated for exact matching
- Tractor hydraulic fluid naming in the title
Cons
- No bullets, so systems beyond the title naming and viscosity are not stated
- Compatibility is not stated
- Warranty is not stated on the listing
- Drain interval is not stated
John Deere Hy-Gard Transmission and Hydraulic Oil
A maker transmission and hydraulic oil in a 32-ounce bottle, listed under part number TY22035 as a replacement for TY22038, with a note to verify compatibility in the owners manual.
Who it's for: Deere owners whose manual names TY22035.
Who should skip it: anyone running other makes, or anyone who needs a larger size than 32 ounces.
Read the full review
The Deere listing is short: a 32-ounce bottle of transmission and hydraulic oil under OEM part number TY22035, replacing prior part number TY22038, weighing 1.6 pounds. The bullets say to refer to the original equipment owners manual to verify compatibility, and the listing states no viscosity, systems beyond the title, or drain interval.
Pros
- Maker part number TY22035 stated
- Replaces prior part number TY22038
- Transmission and hydraulic use named in the title
- Manual compatibility check stated on the listing
Cons
- Warranty is not stated on the listing
- Viscosity is not stated
- Only a 32-ounce size is listed
- OEM Deere part, not a universal fluid
Other machines to compare
Mobil Delvac Tractor Hydraulic Fluid 5 gal PailCheck price on Amazon
Duragard Synthetic Blend Universal Hydraulic Tractor FluidCheck price on Amazon
CAM2 Promax J20-C Tractor Hydraulic FluidCheck price on Amazon
Castrol Transmax ATF/CVT Universal Automatic TransmissionCheck price on Amazon
Buyers ProductsCheck price on Amazon
Tractor hydraulic fluid vs transmission fluid side by side
| Factor | TRIAX Agra UTTO | Kubota Super UDT2 | Mobil Fluid 424 | John Deere Hy-Gard |
|---|---|---|---|---|
| Side | Tractor hydraulic fluid | Transmission fluid | Tractor hydraulic fluid | Transmission fluid |
| Size | 5 Gallon | 1 Gallon | 5 gallons | 32 Ounces |
| Viscosity | SAE 80 (ISO 32/46) | Not stated | Not stated | Not stated |
| Systems covered | Transmissions, final drives, wet brakes, differentials, hydraulics | Hydraulic, final drive, transmission, differential, wet brake | Not stated beyond title naming | Transmission and hydraulic |
| Drain interval | Exceeds 6,000 hours | Not stated | Not stated | Not stated |
| Compatibility | John Deere J20C, Kubota UDT2, Case HyTran | Kubota equipment | Not stated | Owners manual check, part TY22035 |
| Acre Score | 60 | 58 | 54 | 51 |
Figures are as stated in the listings for the example models, collected 1 November 2026.
What each side covers
The listings overlap more than the side names suggest. The TRIAX listing names transmissions, final drives, wet brakes, differentials and hydraulics for its fluid, and the Kubota listing names hydraulic, final drive, transmission, differential and wet brake systems. The Deere bottle names transmission and hydraulic use in its title, while the Mobil pail gives no bullets, so the systems it covers beyond the hydraulic naming in its title are not stated.
That overlap means the side name alone does not sort the choice. A fluid sold as a tractor fluid and a fluid sold as a transmission fluid can both serve the same systems; what differs is how much each listing says about those systems, and whether the fluid is universal, tied to a maker, or leaves that question unanswered, as the Mobil listing does.
Viscosity, compatibility and specs
Only the TRIAX listing states a viscosity, SAE 80 (ISO 32/46), and lists a GL-4 standard. The Kubota, Mobil and Deere listings state no viscosity, so the comparison cannot call a side better on viscosity; only one listing states a grade.
Compatibility differs by listing. The TRIAX maker claims compatibility with John Deere J20C, Kubota UDT2, Case HyTran and other OEM specs. The Kubota fluid is for Kubota equipment, and the Deere bottle is an OEM John Deere part with a note to verify compatibility in the owners manual. The Mobil listing states no compatibility at all.
Sizes and packaging
Among these examples, the two tractor-fluid examples are each listed at 5 gallons, while the two transmission-fluid examples are listed at 1 gallon and 32 ounces. A 5-gallon pail suits a shed that fills several machines, while a smaller bottle suits a shelf where space is tight and the fill is small.
Upkeep
Only the TRIAX listing states a drain interval, with fluid life past 6,000 hours and fewer oil changes claimed by the maker. The Kubota listing claims efficient filterability and corrosion resistance, and the TRIAX listing adds red dye for leak detection and level checks. The Mobil and Deere listings state no drain interval, so plan changes by the manual for those machines.
The examples
Acreage and terrain fit
TRIAX Agra UTTO
Kubota Super UDT2
Mobil Fluid 424
John Deere Hy-Gard
Matching It to Your Property
- Rough ground and mixed chores: the TRIAX listing covers transmissions, final drives, wet brakes, differentials and hydraulics in a fluid.
- Tight shed storage: the Deere bottle is 32 ounces, while the TRIAX and Mobil pails are 5 gallons.
- Kubota-only fleets: the Kubota jug is made for Kubota hydraulic, transmission, differential and wet brake systems.
- Long intervals between changes: the TRIAX maker claims fluid life past 6,000 hours.
The Acre Score explained
The Acre Score weighs five factors: performance (systems covered and stated specs), build quality (formulation and packaging the listing states), value (size and information for the listing), safety (certifications or operator controls the listing states) and warranty (years and coverage). A factor the listing does not state scores zero, which is why every example scores zero for safety and warranty.
| Product | Acre Score | Perf. /35 | Build /25 | Value /25 | Safety /10 | Warranty /5 |
|---|---|---|---|---|---|---|
| TRIAX Agra UTTO | 9.6 | 30 | 21 | 21 | n/a | 0 |
| Kubota Super UDT2 | 9.6 | 29 | 21 | 20 | n/a | 0 |
| Mobil Fluid 424 | 9.5 | 26 | 20 | 20 | n/a | 0 |
| John Deere Hy-Gard | 9.4 | 24 | 19 | 19 | n/a | 0 |
Scores run from 9.2 to 9.8: each product’s point total is placed on that range, so more points always means a higher score. Safety counts only for powered gear or where the listing states safety features; where it does not apply, the score is taken over the remaining 90 points.
If your shed serves mixed makes, a universal fluid covers the named systems across makes from a pail. If your machine stays with its maker, the maker-specific bottle matches the manual when the manual names that maker fluid or part.
Read the manual, keep children and pets out of the yard while you work, wear eye and hearing protection and sturdy footwear, and never exceed the slope rating of your machine. Refuel only with the engine off and cool. See CPSC lawn mower safety. Read our Safety Disclaimer.
FAQ: mowing large lots
Can tractor hydraulic fluid replace transmission fluid?
It depends on the listing and the manual. The TRIAX and Kubota listings each name both transmission and hydraulic systems, so those fluids are trans-hydraulic by their own descriptions. The Deere listing says to verify compatibility in the owners manual, and the Mobil listing states no systems beyond the hydraulic naming in its title, so do not assume a swap without the manual.
What viscosity do these fluids list?
Only the TRIAX listing states a viscosity, SAE 80 (ISO 32/46), and lists a GL-4 standard. The Kubota, Mobil and Deere listings state no viscosity. If your manual names a grade, match it exactly, since the other listings leave the grade unclear.
How often should tractor fluid be changed?
Only the TRIAX listing states an interval, with fluid life past 6,000 hours claimed by the maker. The other listings state no interval, so follow the manual for your machine rather than a general rule.
Does the red dye in tractor fluid matter?
The TRIAX listing says its fluid is red-dyed for leak detection and level checks, so a leak shows as red fluid and the level is easy to check. The other listings state no dye, so color is not a comparison point across these examples.
Can I mix fluids from different makers?
The listings do not address mixing, and a compatibility claim is not a mixing instruction. The Deere listing says to verify compatibility in the owners manual. When the manual does not name the mix, use only the fluid the manual names.
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