Home painted ,car guys.....

I would not worry about the phrase "oil-based". All enamels are really oil-based. Here is a definition from the U.S. EPA:
"Oil-Based Paints:
What is it?
This type of paint is most often used to paint the outside of the house because it dries very hard and withstands harsh weather conditions for a long time. Sometimes people may use oil-based paint indoors in areas that have a lot of moisture such as in kitchens and bathrooms.

What's in it?
The solids in the oil-based paint are kept suspended by a number of chemicals that are organic solvents. The solvents commonly used in oil-based paints include mineral spirits (naphtha), toluene, xylene, and other petroleum distillate solvents. Oil-based paints are sometimes called Alkyd paints. "Alkyd" refers to the resin type that is used in the paint. "