Exactly what it is which forms the final flavour profile of a wine is complex, multi-faceted and in the most part unknown. Despite this particular dominating aroma or flavour have come to define particular varieties. The petrol aroma in Riesling is one of them. I don’t know why, but I just can’t get enough of it, I’m a petrolhead. But what exactly is it? A fault? A varietal characteristic? Whatever it is, it‘s aroma that divides wine lovers and mystifies the casual wine drinker. This post will explore its origins and discuss in more detail viticultural and climatic factors affecting its presence and concentration.