The ventilation hose is screwed to the top of the cylinder head cover. On occasion, you can check if oil deposits have formed in this hose. It can be washed off with gasoline
Tip: The greater the pressure loss during combustion, or rather: the greater the wear of pistons, piston rings and cylinder surfaces, the stronger the pumping of the running engine through the crankcase ventilation occurs. The pressure loss is also clearly visible when the oil filler pipe is open. Professionals can determine the degree of engine wear by the amount of air being pushed out.
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