I'm 1500 miles into my first Red Line oil change. Previous to this, I'd been using Delvac 1 5w-40. I'm using Red Line 10w-40 on this change, and will be using their 5w-40 on the next. My consumption with Delvac 1 was about a quart every 3000 miles. As of right now, I've added two full quarts to keep my level with the Red Line full. I assumed there'd be an adjustment period, but is this kind of consumption normal? Will it settle down over the next change interval? I was given three oil changes worth of Red Line by a friend, but it's very quickly turning into two oil changes worth with all the topping up I'm doing.