Say what? Yup, petrol -- sort of more kerosene than gasoline -- is a classic element of the aroma of mature Riesling. The compound responsible for this aroma has been identified as trimethyl-dihydro-naphthalene, which positively rolls off the tongue!
The precursors to this petrol smell are most likely present in almost all wines but the unique character of the Riesling means that only Riesling is capable of consistently accumulating enough of that long-worded chemical to make it count. So be forewarned, if you don’t like petrol in your wine, drink your Rieslings young!