What exactly do you mean by this? The overflow is designed to drain out onto the ground if overfilled due to expansion in the motor. It's coolant though, not oil. Don't know what you're trying to describe, but at first glance, I don't think you have any issues if it's just a bit of coolant pissing out. :dontknow:Gen 4 zx10 with 5k miles already have a coolant leak. There is oil coming from coolant reservoir overflow WTF is going on, anyone else having this problem or heard of it???