Easy Scent Car Diffuser REFILL for Easy Scent Car Diffuser. To stay alert while driving, the synergy between the essential oils of pamplemousse and geranium (stimulating), nutmeg (invigorating), balsam fir (energizing) and vetiver create a stimulating fragrance. Alcohol-free essential oil fragrance refill - 70 hours. REQUIRES EasyScent Car Diffuser not included. Lampe Berger Easy Scent Car Diffusers. Lampe Berger of Paris, France.