Fluid · Engine Oil
Engine Oil
for 2026 Chevrolet Express 6.6L V8 Duramax Diesel · RWD
Fluid Type
15W-40 CJ-4 diesel oil or 5W-40 full synthetic
Spec: API CJ-4 or CK-4
Capacity
10qt
9.46 L
Drain & Refill
10 qt
9.46 L
Change Interval
5,000 mi
8,045 km
Notes
Capacity with filter. LGH 6.6L Duramax turbo diesel. Use 15W-40 in warm climates, 5W-40 synthetic for cold/all-season.
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