The breather is the tube that connects the engine block to the air intake hose. All excess gas flows through the intake pipe into the intake manifold. When the intake tube is blocked, high pressures can build up in the crankcase and oil can seep through the gaskets and seals. This not only causes the "Check engine" light to come on, but also reduces engine power.
When should you replace the crankcase breathers (oil drain plug)?
The crankcase is the lowest point in the engine and is quite easy to puncture when you run over a pavement, a stone or hit a pothole. The first thing you should notice is that the oil pressure light is on. This means that the crankcase is punctured and you need to stop the engine as soon as possible. Experts recommend that you do not glue a punctured sump and replace it with a new one.
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