A wind-age tray is usually a stamped piece of sheet metal that is mounted between the crank shaft and the oil pan. On slow revving i.e. stock applications there benefit is slight.However race and high RPM applications claim that they actually free up more horsepower. wind-age tray acts like a scraper and removes the oil from the vortex letting it drain back to the oil pan. It does not actually touch the crank shaft but it is close enough to it to skim off the oil and let it drain.