The Kubota GT-21 coolant capacity is listed as 1.66 gal (6.3 L). It also lists coolant type ethylene glycol-based coolant and ASTM D3306 compatible.
Kubota GT-21 Coolant Capacity
| Coolant capacity | 1.59 gal (6 L) |
|---|---|
| Cooling system capacity | 1.66 gal (6.3 L) |
| Coolant type | ethylene glycol-based coolant and ASTM D3306 compatible |
| Coolant change interval | every 700 hours |
| Engine model | Z482-E2-B |
| Engine horsepower | 20.7 hp (15.4 kW) |
| Engine displacement | 1.4 L (85.4 cu in) |
Coolant Capacity Comparison Chart
Coolant capacity comparison
Engine horsepower comparison
Engine displacement comparison
Kubota GT-21 Coolant and Engine Notes
| Coolant capacity note | The Kubota GT-21 coolant spec points to 1.66 gal (6.3 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 GT-21 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 |
| Coolant change interval note | Coolant service for the Kubota GT-21 is listed as every 700 hours. If the service history is unknown, a fresh drain and refill is usually the cleaner move |
| Engine context note | Engine context for the Kubota GT-21: engine model Z482-E2-B, engine horsepower 20.7 hp (15.4 kW), and displacement 1.4 L (85.4 cu in). Engine size helps explain why coolant capacity changes between models |
| Refill note | When refilling the Kubota GT-21, use 1.66 gal (6.3 L) as the planning number and the manual’s coolant mix as the mixture guide. Recheck the level after the thermostat opens |
Kubota GT-21 Coolant Capacity FAQ
How much coolant does the Kubota GT-21 take?
The main coolant amount captured for the Kubota GT-21 is 1.66 gal (6.3 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 GT-21?
Yes. Capacity tells you how much to buy; coolant type tells you what to buy. For the Kubota GT-21, the captured coolant type is ethylene glycol-based coolant and ASTM D3306 compatible.
What antifreeze mix does the Kubota GT-21 use?
The captured antifreeze mix for the Kubota GT-21 is the coolant mix specified in the manual. A 50/50-style mix is the common practical answer unless your manual or climate calls for something different.
When should the Kubota GT-21 coolant be replaced?
Use every 700 hours as the service guide. Coolant can look okay but still lose corrosion protection over time.
What engine specs affect Kubota GT-21 coolant capacity?
The captured engine context is engine model Z482-E2-B, horsepower 20.7 hp (15.4 kW), and displacement 1.4 L (85.4 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.
