247SimpleTests
ASVAB · Cooling, Lubrication, and Electrical

What is the primary function of engine oil?

Reviewed by Jordan Morley, Editorial Lead at 247SimpleTests. Written by the 247SimpleTests Editorial Team from the official source material cited on every question.

Correct answer

To lubricate moving parts, reduce friction and wear, and help carry away heat

  1. A To lubricate moving parts, reduce friction and wear, and help carry away heat
  2. B To fuel the engine
  3. C To clean the windshield
  4. D To inflate the tires

Why this is the answer

Engine oil lubricates the engine's moving parts to reduce friction and wear, and it also helps cool components by carrying away heat, cleans by suspending contaminants, and helps seal gaps. Without adequate oil, metal parts would grind together, overheat, and quickly fail. The oil is circulated by the oil pump and cleaned by the oil filter, and it must be changed periodically as it breaks down and collects debris. Understanding lubrication — and why regular oil changes matter — is central to the cooling-and-lubrication topic on the Auto Information subtest.
Source: ASVAB Auto Information — Engine Oil

Practice more questions

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

Take the Auto Information practice test →

About this topic: Cooling, Lubrication, and Electrical

Cooling, lubrication and electrical questions cover the radiator, thermostat and coolant; engine oil and the oil pump; and the battery, alternator and starter. Overheating and a dead battery are the two scenarios tested most. This is one of 8 Auto Information questions on cooling, lubrication, and electrical, each with a full explanation on a single study page.

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

Related questions

Cooling, Lubrication, and Electrical

How does an automotive cooling system work?

 Cooling, Lubrication, and Electrical

What is the function of motor oil in an engine?

 Cooling, Lubrication, and Electrical

What is the function of the alternator in a vehicle's electrical system?

 Cooling, Lubrication, and Electrical

What is the purpose of a vehicle's catalytic converter?

Recommended study materials

Study guide

ASVAB Total Prep (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 →