It is highly recommended.
remove and replace defective components
Replace every 30,000 miles.
How to replace a water filter on the fridge depends on what model it is. The filter and fridge manual should have directions listed. Usually the front of the bottom of the fridge has to be removed to replace it.
It should be inspected once a year because critters are known to nest in there. Replacing the filter every 35K is a good practice but it really depends on how dusty the driving conditions are.
$10-20 for filter + labor.
It depends on how many miles you drive, and how long you want your car to last.In General you should replace the engine oil and filter, the transmission oil and transmission filter and drain and replace the radiator coolant.You should also replace your air filter,and if your car has an external fuel filter, replace it.If you drive a lot of miles, your engine oil may need to be change sooner.
Oil in an air filter is commonly caused by a bad PCV filter. Check the filter, and replace as needed.
The microwave filter should be replaced every 90 days.
pull the filter out and hose it off, replace the filter, if you vaccum your pool more frequently it should help keep the filter cleaner
I recommend every 50,000 miles.
This filter is a permanent filter and should only be replaced when replacing the fuel pump.