This will vary greatly and come down to driver preference as well as the age of the vehicle and windshield glass as well as how the vehicle is stored, climate, driving habits. Its generally accepted that wiper blades should be replaced every 6-12 months.
In 2008, Consumer Reports did a wiper blade test. All replacement wipers were very good or excellent out of the package. They noted substantial drops in performance at 3 months and at 6 months, only one wiper was rated at better than good. This is a strong statement for the life expectancy to be 6 months.
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Experts say windshield wiper blades should be replaced every six to twelve months, and wiper blade manufacturers recommend changing wiper blades every year.
every year
Replace your wiper blades whenever they stop cleanly removing water from your windshield. You can keep them in good shape by occasionally wiping (Cleaning) them with a cloth with rubbing alcohol on it.
The best way to judge when your blades need to be changed is to look for streaking of the water being wiped away or for chips and breaks along the points of contact. These are the best indicators of the need for new blades.
There are several things that you can do to help stop your windshield wipers from squeaking. Clean the wiper blade often to remove dirt and debris. Squirt windshield cleaner fluid on the windows to remove dirt. Ensure that the wiper is screwed in correctly. Replace the blades when it is needed.
They are replaced when they go bad.
Every time you start to have the lubrication strip turn white it is time to change the blades.
One week
What you meant to ask is how often should the timing belt be replaced! And the answer is every 90,000 miles for b2000 model.Ok
Electric razor blades should be changed once every 12 months, but that could depend on the model of the razor. Changing razor blades properly will ensure an even shave.
When they wear out.
about every 2 years