On my '97 Explorer with 160K miles (just bought), while checking fluids, the power steering fluid is red & looks like tranny fluid. I've heard of people using ATF instead of power steering fluid since it is usually cheaper. However when checking the rear wiper fluid resevior (after buying the truck already) I found a bottle of power steering stop leak shoved in the compartment. The power steering doesn't seem to be acting up & is nice and quit. Should I have the fluid flushed, refill & see what happens or keep like is til something happens? There is no sign of leakage right now.