Automobile Engineering in ME
The purpose of a cylinder head gasket is to

Removes impurities from cylinder head lubricating oil
Prevent the combustion gases from leaking from the joint between the cylinder block and the cylinder head
Prevent engine oil from going into combustion chamber
None of these

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

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

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