International LoneStar · 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 LoneStar
| Fluid | How much | What to buy | Years | Source |
|---|---|---|---|---|
| Engine oil - A26 (pan + filter)Change it: 20,000-50,000 mi by mpg; up to 70,000 with sampling | 42 qt (40 L) | API CK-4, 15W-40 | 2017–2026 | Verified |
| Engine oil - Cummins X15 (pan + filter)Change it: 25,000-75,000 mi by duty | 43.4 qt (41.1 L) steel / 45.4 qt (43.0 L) aluminum | API CK-4, CES 20086, 15W-40 | 2017–2026 | Verified |
| Engine oil - MaxxForce 13 (pan + filter)Change it: 25,000-50,000 mi by mpg band | 42 qt (40 L) | API CK-4, 15W-40 | 2009–2016 | Verified |
| Engine coolant - ELCChange it: Replace 600,000 mi / 6 yr | Not verified - consult OEM service manual | OAT extended-life meeting ASTM D6210 | 2009–2026 | Verified |
| DEF tankChange it: Fill at every fuel stop | 10-20 gal depending on option | ISO 22241 DEF | 2010–2026 | Verified |
Sources: Cummins X15 Quick Reference Guide 6553662; International A26 Specs Card (Navistar); International A26 service data; International LoneStar specification; International MaxxForce service data
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.