Hang these cute car diffusers from your rearview mirror.  They will lightly scent your vehicle for approximately 3 months.   See the directions below.
 
DIRECTIONS:
1. Unscrew the wooden top and remove the plastic plug.
2. Screw the wood top back on.
3. Turn the bottle upside down for approximately 3 seconds and the oil will saturate the wood top.
4. Remove the wood top and replace the plastic plug.  Replace the wood top.
5. Hang from your rearview mirror.
CAUTION:  Saturate the wood top over a napkin or outside of the car.  Do not oversaturate as the excess could drip on your dash and cause some damage.