Originally Posted by Zaggeron

I don't know about the cruise control thing. This might be outdated conventional wisdom. Without any driver aids, if the cruise control senses a drop in speed, it increases throttle to compensate. If the slow-down is due to wheel slippage, then it makes the situation worse. But consider if the VDC is on. If the tires slip, power is cut. Does the cruise control then trump the VDC? Probably not. Worst case, they cancel each out -- which might still be bad. But in all likelyhood the cruise control is cut if VDC kicks in.

My Mazda 3 has neither stability control nor traction control so I definitely keep the cruise control off when it rains. In my Z, I don't think I've ever used it rain or shine ...