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
It is necessary to maintain the valve clearances as they

Make the crankshaft turn smoothly
Increase the speed at which the valves move up and down
Reduce the resistance to sliding that occurs between the cam and the tappet
Allow for lengthening of the valves owing to the heat of combustion

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