You might be right. My manual states, "Engine oil consumption varies, and oil quality deteriorates according to riding conditions and time elapsed," and "Dirty oil or old oil should be changed as soon as possible." It also says for the interval, "Regular = every 8,000 miles." So, does that mean the owner's manual 8,000-mile interval is based on riding my motorcycle like a grandma? And that for fast street/track days, I need to change it every 1500 miles? I'm not sure. Can I change the oil based on color for this motorcycle application?