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<h2>What does an oil filter do?</h2>
An oil filter is an essential component of a vehicle's lubrication system. Its purpose is to remove contaminants and impurities from the engine oil, ensuring that the oil stays clean and provides effective lubrication. Car oil filters consist of a cylindrical housing with a filter media inside, which captures dirt, metal particles, sludge, and other contaminants.
<h2>Types of oil filters</h2>
<ul>
<li>Spin-on filters: Spin-on filters are the most common type found in vehicles. They have a self-contained design with the filter media and housing combined into a single unit. They are easy to install and replace during routine oil changes. The entire filter is typically replaced as a unit.</li>
<li>Cartridge filters: Cartridge filters consist of a replaceable filter element housed in a separate housing. When it's time for an oil change, only the filter element is replaced while the housing is retained. Cartridge filters are more environmentally friendly since only the filter element needs to be disposed of.</li>
<li>Magnetic filters: Magnetic filters use a magnet or magnetic material to attract and capture metallic particles in the engine oil. These filters are particularly effective in trapping small metal shavings and debris. They are often used in conjunction with other types of filters to enhance filtration efficiency.</li>
</ul>
<h2>What happens if you change the oil filter but not the oil?</h2>
Changing the oil filter without changing the oil is not recommended. &nbsp;When you change the oil filter but not the oil:
<ol>
<li>Contaminants remain: By not changing the oil, contaminants like dirt, metal particles, sludge, and combustion by-products will continue to circulate, potentially causing increased wear and damage to the engine.</li>
<li>Reduced filtration efficiency: The new filter may quickly become overwhelmed by the remaining contaminants in the old oil, reducing its effectiveness and potentially allowing contaminants to bypass the filter and circulate in the engine.</li>
<li>Degraded oil properties: Retained oil may have lost its lubricating properties, viscosity, and thermal stability, leading to inadequate lubrication, increased friction, heat, and potential wear on engine components.</li>
<li>Missed maintenance opportunity: Not changing the oil means missing out on the opportunity to remove contaminants, refresh the lubrication system, and ensure optimal engine performance through a comprehensive oil change.</li>
</ol>
In short, changing only the oil filter without changing the oil can lead to retained contaminants, reduced filtration efficiency, potential engine damage, and missed maintenance benefits. It is best to perform complete oil changes for optimal engine health and performance.

Oil Filter

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Air Filter Box

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Air Flow Sensor

Air Intake Duct

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Air Intake Hose

Air Intake Manifold Actuator Control Solenoid

Air Intake Manifold Flap Adjuster

Air Intake Manifold Runner Control Sensor

Electric Vacuum Pump

Engine Air Duct Assembly

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Engine Air Filter

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Intake Manifold

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Intercooler

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Oxygen Sensor

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Pressure Sensor

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Throttle Body

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Air Filters & Intake Systems

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Camshafts

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Engine Valve Cover

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Timing-Control Valve Solenoid

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Valve Lifters Tappet

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Crankshaft Position Sensor

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Engine Oil Dipstick Tube

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Oil Cooler

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Oil Cooler Line

Oil Filler Cap

Oil Filter Base

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Oil Filter Housing

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Oil Level Sensor

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Oil Pan

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Oil Pump

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Oil Pump Pickup Tube

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Camshaft Position Sensor & Magnet Kit

Connector Plug

Distributor Cap

Engine Valve Covers & Ignition Coils Kits

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Ignition Coil

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Knock Detonation Sensor

Relay

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Spark Plug Wire

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Intake Manifold Repair Kit

Engine Components & Accessories

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Auxiliary Water Pump

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Expansion Tank

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Fuel Cooler

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Radiator

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Temperature Sensor

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Turbo Hose

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Water Coolant Pipe

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Water Outlet

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Engine Cooling

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Engine Mount

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Catalytic Converter

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EGR Valve

Emissions Fluid Pump

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Exhaust Fluid Heater

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Exhaust Gas Temperature Sensor

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Exhaust Manifold

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Fuel Vapor Leak Detection Pump

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Nitrogen Oxide Sensor

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Vapor Canister Vent Solenoid

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Exhaust & Emission Systems

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Fuel Filter

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Fuel Injector

Fuel Injector Kit

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Fuel Line Kit

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Fuel Pump

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High Pressure Fuel Pump

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Idle Air Control Valve

Mechanical Fuel Pump

Oil Pressure Relief Valve

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Fuel Systems & Components

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The engine comprises many essential elements such as the lower cylinder block, upper cylinder head(s), and the cooling & lubricating systems. With A-Premium aftermarket engine components, you can expect that your engine deliver years of reliable performance. We offer a diverse selection of engine components from air filters and ignition coils (kits) to fuel pumps to cater to your needs.

BMW 640i Oil Filter