The technicians are both accurate. Wearing valve guides or piston rings may result in excessive blow-by, and a crimped PCV valve hose may let oil into the air cleaner.
What is a piston?
Among other related systems, pistons are found in reciprocating engines, revolving pumps, gas compressor, hydraulic cylinders, and pneumatic cylinders. It is the bevel gear that is enclosed in a cylinder and sealed off from the gas by piston rings. Its function in an engine is to use a piston rod and/or connection rod to transmit force from the expanding gas within the cylinder to the crankshaft.
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