The Case IH STX440QT tractor cooling system capacity is 12 gal | 45.4 L, coolant type is extended-life OAT coolant, and coolant change interval is every 1,000 hours.
Case IH STX440QT Coolant Capacity Details
Cooling system capacity
12 gal | 45.4 L
Coolant type
Extended-life OAT coolant
Coolant change interval
Every 1,000 hours
Radiator cap pressure
16 psi | 110 kPa
Coolant Capacity Comparison Chart
Coolant Capacity Comparison
This model
12 gal
Average
10 gal
Low
6 gal
High
16 gal
Benchmarks use practical low, average and high coolant-capacity ranges for the row-crop tractor category. Use the exact tractor manual before buying coolant.
Case IH STX440QT Extra Coolant Notes
Engine horsepower
440 hp | 328.1 kW
Engine displacement
14.9 L | 908 cu in
Capacity note
For the Case IH STX440QT, the listed cooling system capacity is 12 gal | 45.4 L. Buy slightly more coolant than the exact capacity so you have enough for topping off after air burps out.
Mixture note
Use the coolant type listed above and match the antifreeze/water mix to the operator manual and local freezing conditions.
Radiator cap note
The radiator cap pressure listed for the Case IH STX440QT is 16 psi | 110 kPa. Do not replace it with a random cap unless the pressure rating matches.
Refill note
Refill slowly, run the tractor until warm with the heater circuit open if fitted, let it cool, then recheck the coolant level. Never remove a hot radiator cap under pressure.
Case IH STX440QT Coolant FAQs
How much coolant does a Case IH STX440QT take?
The Case IH STX440QT takes 12 gal | 45.4 L of coolant. That is about normal for the row-crop tractor benchmark shown here, so plan it like a standard drain-and-refill rather than a tiny top-up.
Is the Case IH STX440QT coolant capacity normal?
Yes, 12 gal | 45.4 L lands about where you would expect for this tractor category. The main thing is buying enough for a complete refill plus a small top-off amount.
How many coolant jugs do I need for a Case IH STX440QT?
Do not underestimate this refill. A 12 gal | 45.4 L system needs about 12 one-gallon containers if you are using premixed coolant. If using concentrate at a 50/50 mix, plan on about 6 gal of concentrate and 6 gal of distilled water. In metric terms, that is roughly 10 x 5 L containers for a full premix refill.
Can I mix coolant types in a Case IH STX440QT?
Because the listed coolant is extended-life OAT coolant, the clean move is to stay with the same approved chemistry. Do not casually mix it with old green conventional coolant; if the old coolant type is unknown, flush first or confirm what is already in the system.
Can I use a different radiator cap on a Case IH STX440QT?
The listed cap pressure is 16 psi | 110 kPa. That higher-pressure cap helps raise the boiling point, but only if the radiator neck, hoses and overflow path are in good shape. A weak cap or damaged seat can still cause coolant loss.
When should the Case IH STX440QT coolant be changed?
The listed interval is every 1,000 hours. Hour-based service matters most on working tractors that spend long periods hot under load.
Official information note
Mistakes do happen. Coolant specs can change by year, engine, market, radiator option and coolant chemistry. Check the operator manual, parts book and official caseih.com website before draining, flushing or refilling the cooling system.
