The Kubota M128X coolant capacity is listed as 2.12 gal (8 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 M128X tractor to provide freeze and corrosion protection.
Kubota M128X Coolant Capacity
| Radiator capacity | 2.12 gal (8 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 M128X tractor to provide freeze and corrosion protection |
| Engine model | V3307-CR-TI-E5 |
| Engine horsepower | 128 hp (95.4 kW) |
| Engine displacement | 6.1 L (373.7 cu in) |
Coolant Capacity Comparison Chart
Coolant capacity comparison
Engine horsepower comparison
Engine displacement comparison
Kubota M128X Coolant and Engine Notes
| Coolant capacity note | For the Kubota M128X, 2.12 gal (8 L) is the main coolant capacity captured. Use it as a refill planning number, then confirm the final level at the machine |
|---|---|
| Radiator capacity note | For the Kubota M128X, the captured radiator capacity is 2.12 gal (8 L). If you are doing a full drain, check the full cooling-system capacity too |
| Coolant type note | The captured coolant type for the Kubota M128X is ethylene glycol-based coolant and ASTM D3306 compatible. Do not mix unknown coolant types unless the label and manual say they are compatible |
| Antifreeze mix note | For the Kubota M128X, the captured mix is Kubota recommends a 50: 50 ethylene glycol-based coolant-to-water mix for the M128X tractor to provide freeze and corrosion protection. Straight water is not the right long-term answer unless you are only flushing the system |
| Engine context note | Engine context for the Kubota M128X: engine model V3307-CR-TI-E5, engine horsepower 128 hp (95.4 kW), and displacement 6.1 L (373.7 cu in). Engine size helps explain why coolant capacity changes between models |
| Refill note | For a coolant change on the Kubota M128X, do not just dump in coolant and walk away. Fill slowly, run it up to temperature, cool it down and top up as needed |
Kubota M128X Coolant Capacity FAQ
How much coolant does the Kubota M128X take?
The main coolant amount captured for the Kubota M128X is 2.12 gal (8 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 M128X?
Yes. Capacity tells you how much to buy; coolant type tells you what to buy. For the Kubota M128X, the captured coolant type is ethylene glycol-based coolant and ASTM D3306 compatible.
What antifreeze mix does the Kubota M128X use?
The captured antifreeze mix for the Kubota M128X is Kubota recommends a 50: 50 ethylene glycol-based coolant-to-water mix for the M128X tractor to provide freeze and corrosion protection. A 50/50-style mix is the common practical answer unless your manual or climate calls for something different.
When should the Kubota M128X 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.
Why does the Kubota M128X coolant amount differ from other models?
Coolant capacity changes with engine and radiator setup. For the Kubota M128X, the supporting engine data is engine model V3307-CR-TI-E5, horsepower 128 hp (95.4 kW), and displacement 6.1 L (373.7 cu in).
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.
