Automobile Engineering in ME
The two kinds of piston rings are

Pressure and sealing rings
Compression and oil control rings
Compression and sliding seal rings
Oil scrapper and oil control rings

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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 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

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