the regulator is not a service item...the filter every year or so is a good idea....more often in the SAHARA...also
You should be able to find a shop manual at your local library with the right info...make copies as they are usually only in the REFERENCE section....good luck:)
When it is dirty.
When it is dirty.
Your tank filter should be changed every month. If your filter becomes clogged, it should be changed right away.
Change the oil filter every time you change the oil.
Pre-filter for what? You posted this question in the Fuel Filter category. So I must assume you mean the pre-filter on the fuel pump. That is changed when the fuel pump is replaced.
The fuel filter.
I recommend you change it every 75,000 miles.
whenever you change the oil
Depends on which filter you are asking about. Oil Filter = Every 5,000 miles. Air/Cabin Filter = Every 30,000 miles. Fuel Filter = Every 50,000 miles.
An air purifier's filter should be changed every year, with the pre-filter cleaned or replaced every few months, depending on the conditions that the device operates in. Always follow the manufacturer's instructions.
A Bionaire humidifier with a permanent filter will never need to be replaced. Yet it is necessary to make sure that the filter is cleaned properly on a regular basis.
I change my air filter every 30,000 miles. If you live or drive in a really dusty area you may want to change it more often.