I was wondering if anyone has had an issue where the coolant reservoir is always low. I noticed it was almost empty so I filled it, drove it for half an hour, checked coolant again it was back to where it was. I just changed the oil that day and there was no indication of an internal leak. The cruiser is a 2008 TT and has 217k miles on it. I replaced the radiator, water pump, and thermostat 8 months prior in February so I don't think any of those are related because the radiator was completely full. Could it be something as simple as replacing the reservoir itself or maybe a new cap?