An additive used to improve the ability of a lube oil to reduce friction is known as a/an （）.<br>A:suppressant additive<br>B:dispersant additive<br>C:extreme pressure additive<br>D:viscosity improver additive

An additive used to improve the ability of a lube oil to reduce friction is known as a/an （）.
A:suppressant additive
B:dispersant additive
C:extreme pressure additive
D:viscosity improver additive

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