The Case IH STX380QT tractor cooling system capacity is 30 gal | 113.6 L, coolant type is ethylene glycol-based coolant, and coolant change interval is every 1,000 hours.
Case IH STX380QT Coolant Capacity Details
Cooling system capacity
30 gal | 113.6 L
Coolant type
Ethylene glycol-based coolant
Coolant change interval
Every 1,000 hours
Coolant mixture ratio
50/50 antifreeze and water
Radiator cap pressure
13.1 psi | 90 kPa
Coolant Capacity Comparison Chart
Coolant Capacity Comparison
This model
30 gal
Average
16 gal
Low
10 gal
High
28 gal
Benchmarks use practical low, average and high coolant-capacity ranges for the large ag tractor category. Use the exact tractor manual before buying coolant.
Case IH STX380QT Extra Coolant Notes
Engine horsepower
380 hp | 283.4 kW
Engine displacement
12.9 L | 786 cu in
Capacity note
For the Case IH STX380QT, the listed cooling system capacity is 30 gal | 113.6 L. Buy slightly more coolant than the exact capacity so you have enough for topping off after air burps out.
Mixture note
50/50 antifreeze and water.
Radiator cap note
The radiator cap pressure listed for the Case IH STX380QT is 13.1 psi | 90 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 STX380QT Coolant FAQs
How much coolant does a Case IH STX380QT take?
The Case IH STX380QT takes 30 gal | 113.6 L of coolant. That is above the average large ag tractor benchmark, so buy enough coolant before starting instead of relying on one spare jug.
Is 30 gal | 113.6 L a lot of coolant for a Case IH STX380QT?
Yes. For this tractor category, 30 gal | 113.6 L is above average. This is the sort of refill where you want all coolant on hand before draining, because stopping halfway through the job is annoying and messy.
How many coolant jugs do I need for a Case IH STX380QT?
Do not underestimate this refill. A 30 gal | 113.6 L system needs about 30 one-gallon containers if you are using premixed coolant. If using concentrate at a 50/50 mix, plan on about 15 gal of concentrate and 15 gal of distilled water. In metric terms, that is roughly 23 x 5 L containers for a full premix refill.
What coolant should I use in a Case IH STX380QT?
The listed coolant is ethylene glycol-based coolant. Ethylene glycol tells you the base coolant, but the additive package still matters on diesel engines, so match the manual or an approved equivalent. The listed mix is 50/50 antifreeze and water, so do not run straight water except as a short emergency move.
How much concentrate and water does a Case IH STX380QT need?
With the listed 50/50 antifreeze and water mix, a full 30 gal | 113.6 L refill works out to about 15 gal of antifreeze concentrate and 15 gal of distilled water. If using premix, do not add extra water unless the product label says to.
Can I use a different radiator cap on a Case IH STX380QT?
The listed cap pressure is 13.1 psi | 90 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.
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.
