I seem every 1500 miles or so when I open the hood to check fluids my coolant reservoir is low. It seem like I have to add a cup or 2 every 1500 miles or so. The temperature gauge shows the car is running cool and I have never found any leaks. I replaced the reservoir cap about 2000 miles ago but it doesn't seem to be helping.

So how much water do you add each month to keep your reservoir full? I know it probably depends on temperature but just wanted to know if this was normal. Thanks.

__________________
85 300D Turbo