The Kubota B40 coolant capacity is listed as 2.17 gal (8.2 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 B40 Coolant Capacity
| Cooling system capacity | 2.17 gal (8.2 L) |
|---|---|
| Coolant type | ethylene glycol-based coolant, Kubota Genuine Coolant, and ASTM D3306 compatible |
| Antifreeze mix | 50/50 coolant and water mix |
| Engine model | D1105 |
| Engine displacement | 0.9 L (54.9 cu in) |
Coolant Capacity Comparison Chart
Coolant capacity comparison
Engine displacement comparison
Kubota B40 Coolant and Engine Notes
| Coolant capacity note | The Kubota B40’s key coolant figure here is 2.17 gal (8.2 L) for cooling system capacity. Use that before buying coolant or draining the system |
|---|---|
| Coolant type note | Use the right coolant formula for the Kubota B40: 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 Kubota B40 antifreeze mix is listed as 50/50 coolant and water mix. That is the normal protection range for freezing, boiling and corrosion control |
| Engine context note | For the Kubota B40, the supporting engine specs are engine model D1105 and displacement 0.9 L (54.9 cu in). Use them as context beside the coolant capacity, not as a replacement for the manual |
| Refill note | Coolant changes are simple but easy to do sloppily. On the Kubota B40, plan around 2.17 gal (8.2 L) and confirm the final level after air works out of the system |
Kubota B40 Coolant Capacity FAQ
How much coolant does the Kubota B40 take?
The main coolant amount captured for the Kubota B40 is 2.17 gal (8.2 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 B40?
Yes. Capacity tells you how much to buy; coolant type tells you what to buy. For the Kubota B40, the captured coolant type is ethylene glycol-based coolant, Kubota Genuine Coolant, and ASTM D3306 compatible.
What antifreeze mix does the Kubota B40 use?
The captured antifreeze mix for the Kubota B40 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 B40 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 B40 coolant capacity?
The captured engine context is engine model D1105 and displacement 0.9 L (54.9 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.
