单选题Which lubricating oil additive is used in diesel engines to reduce the tendency for sludge and varnish to form on the engine parts?（）AFlash point improversBPour point improversCInhibitorsDFoam suppressors
单选题
Which lubricating oil additive is used in diesel engines to reduce the tendency for sludge and varnish to form on the engine parts?（）
A
Flash point improvers
B
Pour point improvers
C
Inhibitors
D
Foam suppressors
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