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How often need to change the fuel filter for a 2001 BMW 325i?"
Change the oil filter every time you change the oil.
The most important specifications of air purifiers are the air filters. Today, there are two major types of filters that are used in modern air purifiers and ionizers. People often do not know the difference between a HEPA and HEPA type filter. A true HEPA filter captures more than 99.7 percent of common air allergens. A HEPA type filter captures less allergens, which could be as low as 85 percent. In some air purifiers, there are permanent air filters that only need to be washed or vacuumed. This eliminates the costs associated with replacing the traditional filters every several months.
When it is dirty, I know that is vauge but it is the truth.
I recommend every 50,000 miles.
You need to change the filter with every oil change. Nissan recommends every 3750 miles.
You Need To Change Your Air Filter Every Ten Thousands Miles ( 10,000 ). Unless You Drive In A Dusty Area It Is Best To Change More Often.
Change the fluid and filter every 30,000 miles
whenever you change the oil
air filter every 20,000 miles, i change spark plugs once a year
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.
When its dirty you need to change the filter.