Fluid · Coolant
Coolant
for 1961 Buick Invicta 6.6L (401 cu in) Wildcat 445 Nailhead V8, 4-bbl, 325 hp · RWD
Fluid Type
Ethylene glycol 50/50 conventional green
Capacity
20qt
18.92 L
Drain & Refill
17 qt
16.08 L
Change Interval
24,000 mi
38,616 km
Data quality
Calibrated
Platform-calibrated book-style value. Verification program ongoing.
Notes
Large V8 cooling system capacity. Yearly flush recommended for 1960s technology