The Kubota KB18 coolant capacity is listed as 1.68 gal (6.3 L). It also lists coolant type ethylene glycol-based coolant, Kubota Genuine Coolant, and ASTM D3306 compatible and antifreeze mix 50/50 coolant and water mix.
Kubota KB18 Coolant Capacity
| Cooling system capacity | 1.68 gal (6.3 L) |
|---|---|
| Radiator capacity | 1.59 gal (6 L) |
| Coolant type | ethylene glycol-based coolant, Kubota Genuine Coolant, and ASTM D3306 compatible |
| Antifreeze mix | 50/50 coolant and water mix |
| Coolant change interval | every 2 years |
| Engine horsepower | 17.7 hp (13.2 kW) |
| Engine displacement | 1 L (61 cu in) |
Coolant Capacity Comparison Chart
Coolant capacity comparison
Engine horsepower comparison
Engine displacement comparison
Kubota KB18 Coolant and Engine Notes
| Coolant capacity note | The Kubota KB18’s key coolant figure here is 1.68 gal (6.3 L) for cooling system capacity. Use that before buying coolant or draining the system |
|---|---|
| Radiator capacity note | Radiator capacity is listed as 1.59 gal (6 L). The full cooling system can be higher because coolant also sits in the engine and hoses |
| Coolant type note | Use the right coolant formula for the Kubota KB18: ethylene glycol-based coolant, Kubota Genuine Coolant, and ASTM D3306 compatible. Cheap wrong coolant is not a smart saving if it causes corrosion or deposits |
| Antifreeze mix note | The 50/50 coolant and water mix mix gives the Kubota KB18 coolant system a sensible balance of freeze protection, boil protection and corrosion protection |
| Coolant change interval note | The captured coolant change interval for the Kubota KB18 is every 2 years. Old coolant can lose corrosion protection even if the tractor still runs cool |
| Engine context note | The Kubota KB18 engine data captured here is engine horsepower 17.7 hp (13.2 kW) and displacement 1 L (61 cu in). Bigger engines usually need more coolant and more careful refill bleeding |
| Refill note | Coolant changes are simple but easy to do sloppily. On the Kubota KB18, plan around 1.68 gal (6.3 L) and confirm the final level after air works out of the system |
Kubota KB18 Coolant Capacity FAQ
How much coolant does the Kubota KB18 take?
The main coolant amount captured for the Kubota KB18 is 1.68 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 KB18?
Yes. Capacity tells you how much to buy; coolant type tells you what to buy. For the Kubota KB18, the captured coolant type is ethylene glycol-based coolant, Kubota Genuine Coolant, and ASTM D3306 compatible.
What antifreeze mix does the Kubota KB18 use?
The captured antifreeze mix for the Kubota KB18 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 KB18 coolant be replaced?
Use every 2 years as the service guide. Coolant can look okay but still lose corrosion protection over time.
What engine specs affect Kubota KB18 coolant capacity?
The captured engine context is horsepower 17.7 hp (13.2 kW) and displacement 1 L (61 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.
