The Kubota ZD18 coolant capacity is listed as 1.62 gal (6.2 L). It also lists coolant type ethylene glycol-based coolant and Kubota Genuine Coolant and antifreeze mix 50/50 coolant and water mix.
Coolant capacity1.62 gal (6.2 L)
Coolant typeethylene glycol-based coolant and Kubota Genuine Coolant
Antifreeze mix50/50 coolant and water mix
Kubota ZD18 Coolant Capacity
Coolant capacity
1.62 gal (6.2 L)
Radiator capacity
1.65 gal (6.2 L)
Coolant type
ethylene glycol-based coolant and Kubota Genuine Coolant
Antifreeze mix
50/50 coolant and water mix
Engine horsepower
18 hp (13.4 kW)
Engine displacement
0.7 L (43.9 cu in)
Coolant Capacity Comparison Chart
Coolant capacity comparison
This model
1.62 gal
Average
2 gal
Low
1 gal
High
4 gal
Engine horsepower comparison
This model
18 hp
Average
18 hp
Low
10 hp
High
30 hp
Engine displacement comparison
This model
0.7 L
Average
0.9 L
Low
0.5 L
High
1.5 L
Kubota ZD18 Coolant and Engine Notes
Coolant capacity note
The headline cooling-system number for the Kubota ZD18 is 1.62 gal (6.2 L). Buy enough coolant before opening the drain plug
Radiator capacity note
For the Kubota ZD18, the captured radiator capacity is 1.65 gal (6.2 L). If you are doing a full drain, check the full cooling-system capacity too
Coolant type note
Coolant type for the Kubota ZD18 is listed as ethylene glycol-based coolant and Kubota Genuine Coolant. The safest move is to use coolant that matches the manual’s spec rather than mixing random formulas
Antifreeze mix note
For the Kubota ZD18, 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 ZD18: engine horsepower 18 hp (13.4 kW) and displacement 0.7 L (43.9 cu in). Engine size helps explain why coolant capacity changes between models
Refill note
When refilling the Kubota ZD18, use 1.62 gal (6.2 L) as the planning number and 50/50 coolant and water mix as the mixture guide. Recheck the level after the thermostat opens
Kubota ZD18 Coolant Capacity FAQ
What is the cooling system capacity of the Kubota ZD18?
The Kubota ZD18 cooling system capacity is shown as 1.62 gal (6.2 L). That is the number to use before draining the system.
What coolant type should I use in the Kubota ZD18?
Use ethylene glycol-based coolant and Kubota Genuine Coolant. 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 ZD18?
Not for normal long-term use. The Kubota ZD18 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 ZD18?
Yes. Old coolant can lose protection even if temperature looks normal. The listed service interval for the Kubota ZD18 is the service interval in the operator manual.
Why does the Kubota ZD18 coolant amount differ from other models?
Coolant capacity changes with engine and radiator setup. For the Kubota ZD18, the supporting engine data is horsepower 18 hp (13.4 kW) and displacement 0.7 L (43.9 cu in).
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.
