You may have heard of the Rain-X brand, which is known for its water repellent technology. But the company also offers several different windshield wiper fluids, all of which apply Rain-X technology.

Here's how to check the six essential fluids in your car. After fuel (unless you have a fancy EV), oil is your car's most ...

My Ioniq 5's coolant system got an unwelcome addition. I poured Rain-X into my Ioniq 5's coolant tank instead of coolant. 100 ...