Auto information · Difficulty 1
Try this ASVAB-style question.
Choose your answer before opening the explanation. This original practice item is for preparation and does not reproduce an official test question.
What is the main purpose of engine oil?
- Cool the passenger compartment
- Reduce friction between moving parts
- Increase tire pressure
- Charge the battery
Reveal answer and explanation
Reduce friction between moving parts
Engine oil lubricates moving parts and helps limit friction and wear.