What would be an example of an API rating?  

What does the W after a rating in 5W-20 signify?  

Which of the following is considered a common multigrade engine oil?   

 Lubrication ___________ friction.  

What is the term used to describe the process when gas escapes past the piston rings and into the crankcase?  

What type of oil results in low levels of impurities, increases lubricating abilities, reduces sludge from forming, and protects at extremely high temperatures?    

 Which of the following ratings would be a manufacturer specification?    

What type of engine oil additive keeps contaminants suspended to help prevent sludge from forming?    

What type of engine oil additive helps prevent high temperature oil from becoming too thin?    

The main advantage of synthetic oils is that their molecular structure is _______________.    

 Semi-synthetic oils are a combination of fully synthetic and _____________ base oil.    

Most newer vehicles have a/an _______________________.    

Vehicle usage determines how often you are required to change the oil. Which of the following is NOT a common service interval?    

When installing an oil filter, it is common to tighten it _________ once the gasket contacts the engine.