Each night, we'll post a blog about the day's hand-picked beer in our Big Beery Advent Calendar - why we love the brewery, why we've chosen the beer, why we think you'll love it too. Feel free to comment below or have your say on Twitter.
Harviestoun says: "Ola Dubh 18 is what you get when you age Old Engine Oil in casks formerly used to mature Highland Park 18 (‘Best Spirit in the World’), which imparts a fruity, whisky character into our rich, dark beer."
We say: Like whisky? Like beer? This is your night-before-Christmas-Eve beer. The great thing is, you don't have to stop at just a dram. This is Glenn's stocking stuffer (don't tell him) - beautiful, rich, peaty goodness.