Automobile Engineering in ME
The main purpose of an engine's air cleaner is that it

Prevents rain water from entering the engine
Controls the engine's air intake volume
Prevents dust and other foreign matter from entering the engine
Reduces the engine's air intake noise

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Automobile Engineering in ME
The crankcase dilution means

Dilution of oil by water in the crankcase
Dilution of fuel in the crankcase
Dilution of mixture passing through crankcase in two stroke engines
Dilution of lubrication oil by fuel in the crankcase D. Dilution

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