Oldsmobile 1970 Ninety-Eight Owner's Manual page 35

What you should
klOW about
Air Pollutiol
COltrol SysteJlls
Ol your OldsJllobi Ie
ald the service
they require
B-2
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- . B BlOW BY GAS(S
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Positive Crankcase Ventilation (PCV)
All General Motors vehicles are equipped with Positive
Crankcase Ventilation - a system which permits no crank-
case emission to be discharged into the ambient air. To
function properly, the system depends on the
pev
Valve
(smog valve) which recirculates and bums blow-by gases
inside the engine. This valve must be clean in order to
maintain efficient engine operation. See service recommen-
dations presented on last page of this section.