Fluid · Engine Oil
Engine Oil
for 2013-2026 Kenworth T370 8.9L I6 PACCAR PX-9 · RWD
Fluid Type
10W-30 CK-4 synthetic blend or 15W-40 heavy-duty diesel oil
Spec: API CK-4
Capacity
44qt
41.62 L
Drain & Refill
42 qt
39.73 L
Change Interval
5,000 mi
8,045 km
Data quality
✓ Verified
Cross-checked against OEM or multiple independent sources.
Notes
PACCAR PX-9 (2013+ emission spec). Capacity with filter. CK-4 required for 2017+ EPA emissions
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