The Kubota ST-25 coolant capacity is listed as 1.73 gal (6.5 L). It also lists coolant type ethylene glycol-based coolant and ASTM D3306 compatible and antifreeze mix 50/50 coolant and water mix.
Kubota ST-25 Coolant Capacity
| Coolant capacity | 1.65 gal (6.2 L) |
|---|---|
| Cooling system capacity | 1.73 gal (6.5 L) |
| Radiator capacity | 1.65 gal (6.2 L) |
| Coolant type | ethylene glycol-based coolant and ASTM D3306 compatible |
| Antifreeze mix | 50/50 coolant and water mix |
| Engine displacement | 1.5 L (91.5 cu in) |
Coolant Capacity Comparison Chart
Coolant capacity comparison
Engine displacement comparison
Kubota ST-25 Coolant and Engine Notes
| Coolant capacity note | For the Kubota ST-25, 1.73 gal (6.5 L) is the main coolant capacity captured. Use it as a refill planning number, then confirm the final level at the machine |
|---|---|
| Radiator capacity note | Radiator capacity is listed as 1.65 gal (6.2 L). The full cooling system can be higher because coolant also sits in the engine and hoses |
| Coolant type note | Coolant type for the Kubota ST-25 is listed as ethylene glycol-based coolant and ASTM D3306 compatible. The safest move is to use coolant that matches the manual’s spec rather than mixing random formulas |
| Antifreeze mix note | The 50/50 coolant and water mix mix gives the Kubota ST-25 coolant system a sensible balance of freeze protection, boil protection and corrosion protection |
| Engine context note | The Kubota ST-25 engine data captured here is displacement 1.5 L (91.5 cu in). Bigger engines usually need more coolant and more careful refill bleeding |
| Refill note | When refilling the Kubota ST-25, use 1.73 gal (6.5 L) as the planning number and 50/50 coolant and water mix as the mixture guide. Recheck the level after the thermostat opens |
Kubota ST-25 Coolant Capacity FAQ
How much coolant does the Kubota ST-25 take?
The main coolant amount captured for the Kubota ST-25 is 1.73 gal (6.5 L). Buy a little extra so you can top up after the engine warms up and cools down.
Does coolant type matter on the Kubota ST-25?
Yes. Capacity tells you how much to buy; coolant type tells you what to buy. For the Kubota ST-25, the captured coolant type is ethylene glycol-based coolant and ASTM D3306 compatible.
What antifreeze mix does the Kubota ST-25 use?
The captured antifreeze mix for the Kubota ST-25 is 50/50 coolant and water mix. A 50/50-style mix is the common practical answer unless your manual or climate calls for something different.
When should the Kubota ST-25 coolant be replaced?
Use the service interval in the operator manual as the service guide. Coolant can look okay but still lose corrosion protection over time.
What engine specs affect Kubota ST-25 coolant capacity?
The captured engine context is displacement 1.5 L (91.5 cu in). Engine size is one reason coolant capacity changes between tractors.
Mistakes do happen. Tractor coolant specs can change by year, market, engine, radiator, cab/heater setup and service procedure. Please check the operator manual, decal information and official kubotausa.com website for official information before draining or refilling the cooling system.
