Practice question What does the oil filter do? Increases engine compression ratioRemoves contaminants from circulating engine oilCools the air-conditioning refrigerantMeasures tyre pressure Answer: B — Removes contaminants from circulating engine oil The correct answer is shown above. Try the full quiz for additional practice. Practice more: CCEA GCSE MVRUS Practice Questions - CCEA GCSE Motor Vehicle and Road User Studies (2017) (Northern Ireland) Exam →