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once a month
It should be done once a month
You should change a filter once a month or when airflow lessens, unless it is a reusable filter then clean weekly.
Every other oil change, drain water valve once a month.
My husband worked for an air conditioning company and they recommended that you change your air filter once a month.
About once every month.
You should check the air pressure at least once a month.You should check the air pressure at least once a month.
You should change your oil in your new truck every three thousand miles at least. You should check your oil once in a while. If its a new truck check oil every month.
Once a month
To use the pendulum only in crisis situations, or perhaps once a month, once a day.
It should be trimmed once a week but for a dog once a month.
once a month