It would depend more on how many miles you go before it needs a quart of oil. A healthy engine should go between oil changes without adding oil.
It should be done once a month
You should wash your shutters at least once a month.
You should water it every month. Also water is directly on the soil not the plant.
about every month or every other month.
once a month
On average about once A month.
one time a month
Most dehumidifiers only need to be disinfected once a month or so.
I need someone to clean my house twice a month
You should send flowers when you need to convay a message. Flowers should be the reinforcement to your sentiments when you can't express them enough - wether it's for a birthday, anniversary, or the passing of a love one. There is no limit to how often you can send flowers
Most of the time, every 3 months will suffice. However, in some places and with older and younger horses, you may need to worm more often. Talk with your vet to see what worming medicines you need to give and how often.
should be alittle more than a half of a quart