Fluid · Coolant
Coolant
for 2026 GMC Sierra 1500 3.0L I6 Duramax Diesel · RWD
Fluid Type
Dex-Cool 50/50 orange extended life
Spec: GM 6277M or DEX-COOL approved
Capacity
16qt
15.14 L
Drain & Refill
13.5 qt
12.77 L
Change Interval
150,000 mi
241,350 km
Notes
Diesel cooling system; first change 150k, then every 5 years/150k
As an Amazon Associate and Autel/ANCEL partner, OLP earns from qualifying purchases — how we link. This never changes the specs we publish.