Break apart the garlic bulbs. Place a large knife sideways on a clove or two (make sure the sharp side is facing away from you). Using the palm of your hand carefully but firmly press down on the flat part of the knife. This should crush the cloves of garlic beneath it. You can remove the skin if desired but it is not necessary. Repeat with all the cloves.
Place the oil and crush garlic in a Wok or large pot and heat over Medium heat, stirring occasionally. If oils starts to simmer turn the burner down. You are slowly cooking the garlic to allow its flavor to infuse into the oil and need to take care not to burn the garlic.
After a about 30 minutes the crushed cloves should be golden brown. Using a slotted spoon or mesh ladle remove the all the solids, making sure to drain the oil from each scoop. Allow oil to cool.
Once the oil is cool, strain it through a cheese cloth and place it in a bottle or jar
Garlic oil will keep for up to 4 weeks on the counter or 2 months if refrigerated.