International LT625 · fluids
Fluids & Fill AmountsHow much oil, coolant, DEF and gear oil this truck takes, and what specification to buy.
Set the year first
Then read the How much column as a refill quantity, not a dry fill. Fill to the dipstick or sight glass and treat the number as a starting point — a drain never gets everything out.
Fill amounts for International LT625
| Fluid | How much | What to buy | Years | Source |
|---|---|---|---|---|
| Engine oil - International A26Change it: 20,000-50,000 mi by fuel economy; up to 70,000 mi with oil sampling | 42 qt (40 L) | API CK-4, 15W-40 (10W-30 in cold) | 2017–2026 | Verified |
| Engine oil - Cummins X15 (if fitted)Change it: 25,000-60,000 mi by duty | 43.4 qt (41.1 L) steel pan / 45.4 qt (43.0 L) aluminum pan | API CK-4, CES 20086 | 2017–2026 | Verified |
| Engine coolant - extended life (ELC)Change it: Replace 600,000 mi / 6 years / 12,000 hours; add extender at 300,000 mi | System capacity varies by radiator and heater options | OAT extended-life meeting ASTM D6210 | 2017–2026 | Verified |
| Diesel exhaust fluid (DEF) tankChange it: Fill at every fuel stop | Typically 10-20 gal for a Class 8 tractor | ISO 22241 DEF | 2017–2026 | Unconfirmed |
| Fuel tankChange it: - | Order-specific | ULSD, 15 ppm max | 2017–2026 | Unconfirmed |
| Transmission fluidChange it: 500,000 mi long haul; 300,000 mi regional | Not verified - consult OEM service manual | Per transmission manufacturer | 2017–2026 | Unconfirmed |
| Rear axle / differentialChange it: 500,000 mi long haul; 250,000 mi regional | Not verified - consult OEM service manual | API GL-5 synthetic | 2017–2026 | Unconfirmed |
Sources: Cummins Quick Reference Guide 5410641 (X15 EPA 2017); International A26 Specs Card (Navistar); Third-party PM compilation - confirm with OEM; Third-party compilation - confirm with Navistar
Two ways to wreck an engine in five minutes
Overfilling an oil pan aerates the oil and can damage bearings. Running a cooling system low can crack a liner or a head before the gauge even moves. Fill slowly, then check the dipstick or sight glass twice.