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Blow-by, also known as oil blow-by or engine blow-by, refers to the leakage of combustion gases or pressure into the engine’s crankcase, often occurring when exhaust gas passes the piston rings ¹ ². This can lead to issues like poor engine performance, increased fuel consumption and damage to engine parts ³. Blow-by is a common problem in diesel engines, and it can be caused by worn-out piston rings, eroded cylinders or pistons, and high carbon levels ¹. Regular maintenance and the use of additives can help prevent blow-by ².

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Pros and Cons

Here are the pros and cons of engine blow-by:

Pros of Oil Blow – by :

  • Minor blow-by is a normal and harmless phenomenon in engines
  • It can indicate that the engine is breaking in and the piston rings are seating properly
  • In some cases, blow-by can help to remove excess oil from the engine’s crankcase

Cons of Oil Blow – by:

  • Excessive blow-by can lead to:
    • Oil consumption and loss
    • Increased emissions and pollution
    • Reduced engine performance and power
    • Increased risk of engine damage and failure
    • Higher maintenance costs
    • Potential for engine oil to enter the exhaust system and cause damage
    • Increased risk of overheating and engine damage
  • Blow-by can be a sign of worn or damaged piston rings, cylinders, or other engine components

It’s important to note that while some blow-by is normal, excessive blow-by can be a sign of a serious problem and should be addressed promptly to avoid further damage to the engine.

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