The Kubota ST-30 coolant capacity is listed as 1.59 gal (6 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 ST-30 Coolant Capacity
| Coolant capacity | 1.59 gal (6 L) |
|---|---|
| Cooling system 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 |
| Engine model | D1643 |
| Engine horsepower | 28.7 hp (21.4 kW) |
| Engine displacement | 1.5 L (91.5 cu in) |
Coolant Capacity Comparison Chart
Coolant capacity comparison
Engine horsepower comparison
Engine displacement comparison
Kubota ST-30 Coolant and Engine Notes
| Coolant capacity note | The Kubota ST-30’s key coolant figure here is 1.59 gal (6 L) for coolant capacity. Use that before buying coolant or draining the system |
|---|---|
| Coolant type note | Coolant type for the Kubota ST-30 is listed as ethylene glycol-based coolant, Kubota Genuine 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 ST-30, 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 ST-30: engine model D1643, engine horsepower 28.7 hp (21.4 kW), and displacement 1.5 L (91.5 cu in). Engine size helps explain why coolant capacity changes between models |
| Refill note | When refilling the Kubota ST-30, 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 ST-30 Coolant Capacity FAQ
What is the cooling system capacity of the Kubota ST-30?
The Kubota ST-30 cooling system capacity is shown as 1.59 gal (6 L). That is the number to use before draining the system.
What coolant type should I use in the Kubota ST-30?
Use ethylene glycol-based coolant, Kubota Genuine Coolant, and ASTM D3306 compatible. The blunt rule is simple: match the manual’s coolant spec and do not mix unknown coolant formulas.
Should I use straight water in the Kubota ST-30?
Not for normal long-term use. The Kubota ST-30 should use 50/50 coolant and water mix or the manual’s specified coolant mix so the system gets corrosion, freeze and boil protection.
Does old coolant matter in the Kubota ST-30?
Yes. Old coolant can lose protection even if temperature looks normal. The listed service interval for the Kubota ST-30 is the service interval in the operator manual.
What engine specs affect Kubota ST-30 coolant capacity?
The captured engine context is engine model D1643, horsepower 28.7 hp (21.4 kW), and displacement 1.5 L (91.5 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.
