The Kubota KB20 coolant capacity is listed as 1.59 gal (6 L). It also lists coolant type ethylene glycol-based coolant and ASTM D3306 compatible and antifreeze mix 50/50 coolant and water mix.
Kubota KB20 Coolant Capacity
| Coolant capacity | 1.59 gal (6 L) |
|---|---|
| Cooling system capacity | 1.59 gal (6 L) |
| Coolant type | ethylene glycol-based coolant and ASTM D3306 compatible |
| Antifreeze mix | 50/50 coolant and water mix |
| Engine horsepower | 19.7 hp (14.7 kW) |
Coolant Capacity Comparison Chart
Coolant capacity comparison
Engine horsepower comparison
Kubota KB20 Coolant and Engine Notes
| Coolant capacity note | The Kubota KB20 coolant spec points to 1.59 gal (6 L). Do not rely on the radiator-only amount if the full cooling-system capacity is available |
|---|---|
| Coolant type note | Coolant type for the Kubota KB20 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 | For the Kubota KB20, the captured mix is 50/50 coolant and water mix. Straight water is not the right long-term answer unless you are only flushing the system |
| Engine context note | Engine context for the Kubota KB20: engine horsepower 19.7 hp (14.7 kW). Engine size helps explain why coolant capacity changes between models |
| Refill note | When refilling the Kubota KB20, use 1.59 gal (6 L) as the planning number and 50/50 coolant and water mix as the mixture guide. Recheck the level after the thermostat opens |
Kubota KB20 Coolant Capacity FAQ
How much coolant does the Kubota KB20 take?
The main coolant amount captured for the Kubota KB20 is 1.59 gal (6 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 KB20?
Yes. Capacity tells you how much to buy; coolant type tells you what to buy. For the Kubota KB20, the captured coolant type is ethylene glycol-based coolant and ASTM D3306 compatible.
What antifreeze mix does the Kubota KB20 use?
The captured antifreeze mix for the Kubota KB20 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 KB20 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.
Why does the Kubota KB20 coolant amount differ from other models?
Coolant capacity changes with engine and radiator setup. For the Kubota KB20, the supporting engine data is horsepower 19.7 hp (14.7 kW).
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.
