247SimpleTests
ASVAB · General

What is the purpose of engine oil?

Correct answer

To lubricate moving engine parts, reduce friction, and help cool and clean the engine

  1. A To cool the radiator
  2. B To lubricate moving engine parts, reduce friction, and help cool and clean the engine
  3. C To power the spark plugs
  4. D To inflate the tires

Why this is the answer

ENGINE OIL LUBRICATES moving engine parts, REDUCING FRICTION and wear; it also helps COOL and CLEAN the engine (carrying away heat and contaminants). ASVAB Auto Information tests the lubrication system. Without oil, metal parts would grind together, overheat, and seize. Oil must be changed periodically because it degrades and collects contaminants. The OIL FILTER removes particles. Knowing oil's primary job (lubrication/reducing friction, plus cooling and cleaning) is commonly tested auto knowledge.
Source: ASVAB Auto Information — Lubrication System

Practice more questions

This question is from our ASVAB Practice Tests practice test. Take the full practice test to test your knowledge across all General and other topics.

Take the Auto Information practice test →

New to this exam? Our ASVAB exam guide explains the format, scoring, and how to prepare.

Related questions

General

What is the main function of the alternator in a vehicle?

 General

What does the cooling system (radiator and coolant) do in a vehicle?

 General

What component ignites the air-fuel mixture in a gasoline engine?

 General

What is the function of the brake system's master cylinder?

Recommended study materials

Study guide

ASVAB Total Prep 2024–2025 (Kaplan)

Kaplan's complete ASVAB guide with 1,000+ practice questions, 6 full-length tests, and AFQT focus.

Check Price → Study guide

Barron's ASVAB with Online Tests 12th Ed.

Comprehensive ASVAB review for all nine subtests with full-length practice exams and online tools.

Check Price → Study guide

ASVAB for Dummies 4th Ed. (Wiley)

Accessible, thorough ASVAB prep covering all subtests with tips for boosting your AFQT score.

Check Price →

As an Amazon Associate, CJ Affiliate, and AWIN publisher we earn from qualifying purchases. Links above are affiliate links. Full disclosure →