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Your oil filter doesn’t just filter waste. Its many parts work together to clean the oil and keep it in the right place at the right time.

• Tapping Plate: Oil enters and exits the oil filter through the tapping plate, which looks like a center hole surrounded by smaller ones. Motor oil goes through the smaller holes, through the filter material, and then flows to your engine through the center hole.
• Filter Material: The filter is made of a mesh of synthetic fibers that act as a sieve to catch grit and grime in the motor oil. The material is folded into pleats to create a greater surface area.
• Anti-Drain Back Valve: When your vehicle is not running, this valve flaps shut to prevent oil from seeping back into your oil filter from the engine.
• Relief Valve: When it’s cold outside, motor oil can thicken and struggle to move through the filter. The relief valve discharges a small amount of unfiltered motor oil to give your engine a boost until it warms up.
• End Discs: Two end discs on either side of the oil filter, made of metal or fiber, prevent unfiltered oil from passing through to your engine.

You don’t need to remember all of these parts, of course, but knowing how they all work together can help you realize how important it is to replace your oil filter.