My Groove Wheel unit has been steadily losing intensity of color. Recently the red oil has completely faded to being almost indistinguishable from no color at all, remaining only as a very light pink. Is it normal for the Groove Wheel's oil wheel to lose its color over time? I see that additional wheels are available via the parts store, I'm just wondering if this is normal wear for a Groove Wheel or if this represents another problem that can be remedied.
Thanks for any insight.
Original Post