An oil change may seem simple, but it plays a critical role in keeping your vehicle reliable, efficient, and protected from costly engine damage. Understanding how an oil change works—step by step—helps you see why this routine service is one of the most important parts of vehicle maintenance.
Below is a clear, easy-to-follow breakdown of how an oil change works, what happens at each stage, and why every step matters.
Step 1: Preparing the Vehicle
Before any oil is changed, the vehicle is safely positioned on a lift or ramps. This provides access to the underside of the engine where the oil drain plug and oil filter are located.
At this stage:
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The engine is usually warm (not hot) so the oil flows freely
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The technician verifies the correct oil type and capacity
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Basic safety checks are completed
Proper preparation ensures the oil drains completely and cleanly.
Step 2: Draining the Old Engine Oil
Once the vehicle is ready, the technician removes the oil drain plug located at the bottom of the engine oil pan.
What happens during this step:
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Old, dirty oil flows out of the engine
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Contaminants like dirt, metal particles, and sludge are removed
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The oil is collected for proper recycling
This step is crucial because old oil loses its lubricating properties and can no longer protect engine components.
Step 3: Removing the Old Oil Filter
The oil filter is responsible for trapping dirt, debris, and contaminants. Over time, it becomes clogged and less effective.
During this step:
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The old oil filter is carefully removed
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Residual oil is allowed to drain
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The filter mounting surface is cleaned
Replacing the oil filter ensures that fresh oil stays clean and flows properly through the engine.
Step 4: Installing a New Oil Filter
A new oil filter is installed before adding fresh oil.
Key actions include:
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Lightly lubricating the filter gasket with clean oil
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Installing the filter to manufacturer specifications
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Ensuring a proper seal to prevent leaks
A high-quality oil filter helps maintain oil pressure and protects the engine from harmful particles.
Step 5: Reinstalling the Drain Plug
After the old oil has fully drained, the drain plug is reinstalled and tightened to the correct torque.
Why this matters:
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Prevents oil leaks
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Protects the oil pan threads
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Ensures engine oil stays sealed
This step may seem minor, but improper installation can lead to serious oil loss.
Step 6: Adding Fresh Engine Oil
With the system sealed, fresh oil is added through the engine’s oil fill cap.
During this step:
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The correct oil viscosity and type are used
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Oil is measured precisely to match manufacturer requirements
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The oil cap is securely replaced
Fresh oil restores lubrication, reduces friction, and helps regulate engine temperature.
Step 7: Checking Oil Level and Quality
After filling, the oil level is checked using the dipstick or electronic monitoring system.
This confirms:
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The oil level is within the safe range
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There are no visible leaks
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The oil pressure builds correctly when the engine starts
Accurate oil levels are essential for proper engine performance.
Step 8: Running the Engine and Final Inspection
The engine is started briefly to circulate the new oil.
Technicians check for:
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Oil leaks around the filter and drain plug
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Proper oil pressure
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Smooth engine operation
Once verified, the oil change is complete.
Step 9: Resetting the Oil Life Monitor
Most modern vehicles have an oil life monitoring system. After the oil change, this system is reset so the vehicle can accurately track when the next service is due.
This helps:
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Prevent missed oil changes
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Maintain warranty compliance
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Keep maintenance schedules accurate
Why Each Step Matters
Skipping or rushing any step can lead to:
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Poor lubrication
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Oil contamination
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Engine overheating
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Long-term mechanical damage
A proper oil change ensures every component in the engine is protected and functioning as designed.
How Long Does an Oil Change Take?
Most oil changes take 15–30 minutes, depending on the vehicle and service requirements. Despite being quick, the impact on engine health is long-lasting.
Frequently Asked Questions
Can I change my oil myself?
Yes, but proper tools, correct oil, and safe disposal are required. Professional service ensures everything is done correctly.
How often should oil be changed?
Intervals vary based on vehicle and oil type, but following manufacturer guidelines is always recommended.
Does changing oil improve performance?
Yes. Clean oil helps engines run smoother, quieter, and more efficiently.
Is synthetic oil different from conventional oil?
Synthetic oil offers better protection, especially in extreme temperatures and longer intervals.
Protect Your Engine with Regular Oil Changes
Understanding how an oil change works shows why this simple service is essential for engine longevity and reliability. Regular oil changes help prevent breakdowns, improve efficiency, and protect your investment.
📞 For more information or to book an oil change, call (780) 457-7587.