The Kubota GB13 coolant capacity is listed as 1.59 gal (6 L). It also lists coolant type ethylene glycol-based coolant and ASTM D3306 compatible and antifreeze mix Kubota recommends a 50: 50 ethylene glycol-based coolant-to-water mix for the GB13 tractor to protect against freezing and overheating.
Kubota GB13 Coolant Capacity
| Coolant capacity | 1.59 gal (6 L) |
|---|---|
| Radiator capacity | 1.59 gal (6 L) |
| Coolant type | ethylene glycol-based coolant and ASTM D3306 compatible |
| Antifreeze mix | Kubota recommends a 50: 50 ethylene glycol-based coolant-to-water mix for the GB13 tractor to protect against freezing and overheating |
| Engine model | D662 |
| Engine horsepower | 13.5 hp (10.1 kW) |
| Engine displacement | 0.7 L (42.7 cu in) |
Coolant Capacity Comparison Chart
Coolant capacity comparison
Engine horsepower comparison
Engine displacement comparison
Kubota GB13 Coolant and Engine Notes
| Coolant capacity note | For service planning, the Kubota GB13 should be treated as 1.59 gal (6 L) coolant capacity. That is a compact tractor cooling system where a normal premixed coolant jug may cover most of the refill |
|---|---|
| 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 | For the Kubota GB13, coolant type matters as much as capacity. The clean captured value is ethylene glycol-based coolant and ASTM D3306 compatible |
| Antifreeze mix note | The Kubota recommends a 50: 50 ethylene glycol-based coolant-to-water mix for the GB13 tractor to protect against freezing and overheating mix gives the Kubota GB13 coolant system a sensible balance of freeze protection, boil protection and corrosion protection |
| Engine context note | The Kubota GB13 engine data captured here is engine model D662, engine horsepower 13.5 hp (10.1 kW), and displacement 0.7 L (42.7 cu in). Bigger engines usually need more coolant and more careful refill bleeding |
| Refill note | The practical service move for the Kubota GB13: buy enough coolant for 1.59 gal (6 L), fill to spec, run the engine, then recheck the radiator and overflow bottle after cooling |
Kubota GB13 Coolant Capacity FAQ
What is the cooling system capacity of the Kubota GB13?
The Kubota GB13 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 GB13?
Use ethylene glycol-based 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 GB13?
Not for normal long-term use. The Kubota GB13 should use Kubota recommends a 50: 50 ethylene glycol-based coolant-to-water mix for the GB13 tractor to protect against freezing and overheating or the manual’s specified coolant mix so the system gets corrosion, freeze and boil protection.
Does old coolant matter in the Kubota GB13?
Yes. Old coolant can lose protection even if temperature looks normal. The listed service interval for the Kubota GB13 is the service interval in the operator manual.
What engine specs affect Kubota GB13 coolant capacity?
The captured engine context is engine model D662, horsepower 13.5 hp (10.1 kW), and displacement 0.7 L (42.7 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.
