Gives a huge increase in crankcase depression.
An old engine will often be covered with oil on the outside and drips on the ground.
The apparently simple engine breather, when in working condition (they dont last forever, say - 5 yrs. maximum), creates a partial vacuum inside the crankcase which means that at the point of a potential oil leak the engine tends to suck air in rather than leak!
If you open the lid of the breather with engine running oil and fumes will always gush out - that is normal! On each down stoke of the piston any air inside the crankcase is compressed, if pressure cannot escape the resulting power loss can be 2bhp. (5mph from top speed, 6mpg consumption increase). Fitting new often improves starting too!
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