Give a type of lubricant (in general).
oil, grease
Someone wants to change oil "at home". Why can it be risky?
If you make a mistake it can cause a heat or friction.
Changing oil requires also other elements to be changed. What are they?
oil filter, oil pump
Why do you use grease gun?
to pump grease
What can be used to lubricate engine parts?
grease
