International Engines | Engine Oil Specifications

International Engines

International (Navistar) heavy-duty diesel engines used in LT Series and RH trucks. Oil specifications, MS-1224 requirements, and drain intervals.

Engine Pages


12.4L

LT Engine (A26)

API CK-4 / MS-1224. 15W-40. No FA-4.

View spec →


12.4L

A26

Same platform as LT. API CK-4 / MS-1224.

View spec →

CK-4 vs FA-4OEM drain intervalsBest oil for semi trucks

Scroll to Top