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Crankcase Ventilation Systems - Closed System: Description

A "closed" positive crankcase ventilation system is used on all 1970-71 vehicles equipped with exhaust emission control.

NOTE: For 1971 232" 6 Cyl. and all 1972 Engines refer to "American Motors" in this section. Service 1971 system at 2.000. 6, 000 and every 6.000 miles thereafter.
NOTE: For V8 Engines refer to "Buick" in this section. Service system at 2, 000, 6, 000, and every 6, 000 miles thereafter.
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