Rick's Free Auto Repair Advice

Posts Tagged: Oil catch can

Oil catch can

Oil catch can — What is it? How does it work? All engines, even new ones allow some gasses of combustion to seep past the piston rings and into the crankcase. The escaped gasses are referred to as blow-by. During a cold start when the air/fuel mixture is very rich (high fuel content), blow-by consists of raw fuel, soot, acids, water and motor oil washed from the cylinder walls. All this winds up in the crankcase. Normally blow-by is sucked into the intake manifold via the positive crankcase ventilation system … Read More


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