This is one of the more overlooked fluids in a vehicle's maintenance regime. When coolant gets old its pH changes, which can damage engine parts, gaskets and seals. You want to avoid allowing your engine to rot from the inside, so having the coolant flushed and changed every three years is a good idea however manufacturer recommendations vary and some newer vehicles specify every 10 years or 100,000 miles.
Did you know that you need to get your brake fluid changed? A lot of people are unaware of this vital procedure. In order to keep it from boiling at the high temperatures generated by hot brakes, brake fluid contains chemicals that also cause it to absorb moisture. When brake fluid contains moisture, it will boil. It's also incredibly corrosive, which is why it turns reddish brown when it's been left in the system for too long.
Power Steering Fluid
Some manufacturers recommend replacement every three years or 30,000 miles, but every manufacturer has different specifications with regard to interval and type of fluid. If you're lucky, your car has one of those new-fangled electric steering systems and you don't have to worry about this one!