Discussion
A detergent-dispersant additive in an engine oil serves to
Answer: A
Correct answer: keep deposits suspended and neutralise acids
The detergent keeps surfaces clean and carries a reserve of alkali that neutralises the acids formed by combustion and oxidation; the dispersant keeps the resulting soot and sludge finely suspended so that it is carried to the filter rather than settling. Together they are what allow long drain intervals.
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