First post here, unfortunately with an issue! The engine management light on my 2016 A7 272 came on today, when I checked under the bonnet, I noticed a fair amount of a white crystalline substance in the engine bay, situated mostly around the exhaust manifold (see pic). Some digging revealed this to be an AdBlue leak, its not toxic apparently, just unsightly. I'm waiting for the dealers to get back to me with an appointment. The car was serviced 600km ago and Adblue tank was topped up in and around that time. I'm interested to know if other owners have had similar issues and how common this issue is. Also, can I drive the car in the interim, albeit for short journeys?