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For your 2018 Mazda3, you'll need to use a 24-inch wiper blade for the driver's side and an 18-inch blade for the passenger side. This holds true for all models manufactured since 2014. In the past, older models had a passenger blade that was one inch longer. The wiper blades should be replaced every one to three years, depending on usage. If you reside in an area with harsh weather conditions, it's advisable to replace them annually. A new set of wiper blades typically ranges from $15 to $30, but it's recommended to opt for the higher-priced ones as they'll require less frequent replacement.
The passenger side of your car in 2018 Mazda 3 requires 18-inch wiper blades.