Instead of allowing pressure to build unchecked in the crankcase, the PCV valve routes these blow by gases back into the intake manifold. Excessive cylinder wall wear or scoring.
How Engine Age Worsens Oil Blow-by and Its Impact
Symptom Likely Cause Severity Blue exhaust smoke Burning oil from ring gap High Rapid oil consumption Compromised ring seal Medium to High Oil leak at seals Crankshaft seal failure due to pressure Medium Consequences of Neglect. Extended periods of short-trip driving causing condensation and sludge.
Worn or broken piston rings. Internally, a sudden drop in oil level between changes or milky discoloration in the oil dipstick indicates that fuel or moisture is mixing with the lubricant due to blow by contamination.
How Engine Age Worsens Oil Blow-by and Its Impact
This process occurs under the high pressure generated during the power stroke, forcing past the compression rings and into the space below the pistons. Mechanics of Blow By The phenomenon occurs primarily due to the pressure differential created when the combustion chamber ignites the air-fuel mixture.
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