Fluid · Rear Differential
Rear Differential
for 1961 Pontiac Catalina 421ci V8 · RWD
Fluid Type
80W-90 or 90 weight gear oil
Spec: API GL-5
Capacity
3.5qt
3.31 L
Drain & Refill
3.5 qt
3.31 L
Change Interval
36,000 mi
57,924 km
Notes
421 Super Duty typically equipped with Safe-T-Track requiring friction modifier. Performance use warrants more frequent service.
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