Automobile Engineering in ME
The difference between DOT 3 and DOT 4 brake fluids is

DOT 4 fluids have a lower boiling point than DOT 3 fluid
DOT 4 fluids have a higher boiling point than DOT 3 fluid
DOT 4 fluid is more resistant to freezing than DOT 3 fluid
DOT 3 and DOT 4 fluids have the same boiling point, but DOT 4 fluid has a longer service life

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Automobile Engineering in ME
The crankcase dilution means

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

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