The Kubota STW40 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.
ethylene glycol-based coolant, Kubota Genuine Coolant, and ASTM D3306 compatible
Engine horsepower
38.5 hp (28.7 kW)
Engine displacement
1.8 L (111.4 cu in)
Coolant Capacity Comparison Chart
Coolant capacity comparison
This model
2.17 gal
Average
2 gal
Low
1 gal
High
4 gal
Engine horsepower comparison
This model
38 hp
Average
35 hp
Low
20 hp
High
60 hp
Engine displacement comparison
This model
1.8 L
Average
1.7 L
Low
0.9 L
High
3 L
Kubota STW40 Coolant and Engine Notes
Coolant capacity note
The Kubota STW40 coolant spec points to 2.17 gal (8.2 L). Do not rely on the radiator-only amount if the full cooling-system capacity is available
Radiator capacity note
Radiator capacity is listed as 2.17 gal (8.2 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 STW40: 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
Engine context note
The Kubota STW40 engine data captured here is engine horsepower 38.5 hp (28.7 kW) and displacement 1.8 L (111.4 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 STW40, plan around 2.17 gal (8.2 L) and confirm the final level after air works out of the system
Kubota STW40 Coolant Capacity FAQ
How much coolant does the Kubota STW40 take?
The main coolant amount captured for the Kubota STW40 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 STW40?
Yes. Capacity tells you how much to buy; coolant type tells you what to buy. For the Kubota STW40, the captured coolant type is ethylene glycol-based coolant, Kubota Genuine Coolant, and ASTM D3306 compatible.
What antifreeze mix does the Kubota STW40 use?
The captured antifreeze mix for the Kubota STW40 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 STW40 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 STW40 coolant capacity?
The captured engine context is horsepower 38.5 hp (28.7 kW) and displacement 1.8 L (111.4 cu in). Engine size is one reason coolant capacity changes between tractors.
Official information note
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.
