Can you drive with a missing oil fill cap — what can happen? Driving with a missing oil fill cap can be dangerous Every engine produces blow-by; gasses that escape past the piston rings and enter the crankcase. When the oil fill cap is in place, the positive crankcase ventilation system (PCV) sucks the blowby out of the crankcase and sends it into the intake manifold to be burned. But when the oil fill cap is missing, the PCV system can’t work properly and the blow-by blows out the oil … Read More

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