Fluid · Coolant
Coolant
for 2023-2026 Isuzu NPR 6.6L V8 · RWD
Fluid Type
Dex-Cool 50/50 orange extended life
Spec: GM6277M or ASTM D3306
Capacity
21qt
19.87 L
Drain & Refill
17 qt
16.08 L
Change Interval
150,000 mi
241,350 km
Data quality
Calibrated
Platform-calibrated book-style value. Verification program ongoing.
Notes
GM OAT coolant system. First change 150k miles or 5 years, then every 5 years. Do not mix with other coolant types.
As an Amazon Associate and Autel/ANCEL partner, OLP earns from qualifying purchases — how we link. This never changes the specs we publish.