The Saga of Tobermory, Pt. 1: New legislation requires car manufacturers to program diesel cars to break down (refuse to start) if they run out of adblue (simplistically: an emissions reducer). I knew almost nothing of it when I rented a diesel @Renault from @SixtUK in Glasgow. The S of T, Pt. 2: Upon departing the rental lot, a strange orange light appeared in the dash, like a penguin flying over a choppy sea in the rain. As mysterious as a Viking twig rune. No manual in the van. I googled to no avail. Later, text appeared: ADBLUE LOW. I googled again.