The other day, I rode my bike to work, nothing out of the ordinary. When I was ready to come home, I glanced at the oil window, and saw no oil. The bike is always parked on the center stand. In a panic, I called my wife, and asked her to bring me some oil, from the garage. While waiting for her, I looked all around, and under the bike. I felt the engine cases, and under the engine and frame, no leaks. I've recently done some upgrades, by adding a NGK CR8EIX 4218 Iridium spark plug, a PoweRage exhaust, a K&N air filter, and a Booster Plug. The bike runs great, and has way more useable power, but I was thinking, maybe it was burning oil? Its a 2019 model with 4800miles on it, so, I doubt it. When she arrived with the oil, I poured in enough to bring it up to normal, and rode part way home and stopped to get a burger. After we finished eating, I again, looked at the oil window, and it was plumb full, no gap visible, full! I thought, "crap", now what? I decided to ride it the short way home, and deal with it in the morning. I drained the oil, and did an oil and filter change. All has been well since then, no leaks, and no problems what so ever. My question is, where did the oil go that day? There was none visible in the window. Has anyone experienced this problem before? Where was the oil hiding?