I spoke to my dealer yesterday as about every 1500 or so miles I end up putting about 3/4" of coolant in the plastic tank to bring it up to par. I have looked all around with the LED infrared light but no sign of any leaks. Oil is not milky so head gasket is fine. Dealer did say that it could be going out the exhaust but no steam can be seen and the amount of loss is very small for the time period so if it is going out the exhaust it is undetectable. I am averaging about 800-1000 miles a month so this is an on going thing.
Dealer also says there are no recalls on the tank.
Hose connections all seem fine. Only other thing I can think of is the cap seal may be letting vapor out over time.
Any others out there having to replace coolant at this or other intervals? 3/4" of fluid is not a big deal but I shouldn't have to do this. I really don't want to spent 150 bucks on a new tank if I don't have to. Any thoughts??