Mark Jordan, Analyst, Goldman Sachs : I think a good place to start might be to because some in the audience may not be familiar with how the Quick Lube model is different from the auto service that they see at the local garages on the corner, right? And so can you describe how it differentiates from that service? And maybe talk about what's offered at a Valvoline instant oil change store? What makes Valvoline stand out? And what the value proposition is for your customers?