I've had the Radix on for a few years now and i've noticed that i have to add about a cup of dex-cool to the resevoir every few months. Is this normal?

I also clean the resevoir every time I add coolant and it's pretty dirty. I have a feeling that fluid is very slowly leaking out of the resevoir and dirt is sticking to the residue on the container.

 

I've had mine on for almost a year now, mine is still nice and tight. Level is still dead on where I initially filled it. I would be curious though of what others have to say.

 

I've never had to add coolant to my reservoir in about 6-1/2 years with the Maggie.

 

Never have to add to mine either. It's going somewhere.....

 

You could pressurized the system, and maybe find a leak. If the pressure bleeds off, then it is leaking somewhere. If you can see a leak it could be the intercooler, or the fittings that run through the upper intake manifold. It should not lose any fluid over a period of time.