Fluid · Coolant
Coolant
for 2014 GMC Sierra 2500HD 6.6L V8 Duramax Diesel · 4WD
Fluid Type
Dex-Cool 50/50 orange
Spec: GM 6277M or equivalent long-life OAT
Capacity
21qt
19.87 L
Drain & Refill
18 qt
17.03 L
Change Interval
150,000 mi
241,350 km
Data quality
Book-style estimate
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Notes
Duramax diesel has larger cooling system; first change at 150k, then every 5 years/150k
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