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Mazda Mazda6 2.5L I4 Engine Oil Change Guide
How to change the motor oil and filter on the SKYACTIV-G 2.5L I4 engine in a 3rd generation 2014 to 2018 Mazda 6.

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2016 Mazda 6 2.5L I4
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Dipstick & Oil Filler Cap
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Twist Off Counterclockwise

This automotive maintenance tutorial was specifically written to assist owners of the third generation (2014, 2015, 2016, 2017 and 2018) Mazda Mazda6 sedan in changing the motor oil and replacing the oil filter on the SkyActiv-G DOHC 16V VVT 2.5 liter inline four cylinder engine.

Owners of other Mazda vehicles such as the Mazda2, Mazda3, Mazda5, CX-3, CX-5, CX-7, CX-9, and the MX-5 Miata may also find these DIY instructions to be helpful.

The tools and other items needed to complete this procedure include a floor jack, two jack stands, a Phillips head screwdriver (or an 8mm socket with a 1/4" drive ratchet), a flathead screwdriver, an 8mm hex head socket with a 3/8" drive ratchet or an 8mm Allen key wrench, a used oil catch container, a Lisle 63600 oil filter wrench, an automotive funnel, 5 U.S. quarts (or 4.5L) of SAE 0W-20 oil and a new oil filter.

A few compatible replacement oil filters with their part numbers are as follows: Mobil 1 M1-108, Fram PH6607, Bosch 3300, Royal Purple 10-2876, Pennzoil HPZ-37, Mahle OC 711, Purolator L14612 and Wix 57002.

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Pull Up Oil Dipstick
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Raise Front of Car
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Oil Service Access Cover
The first three steps are to warm up the engine for a few minutes, park the car on a level surface and turn off the ignition.

Warming up the engine will suspend any contaminants or fine metal shavings within the old oil and also allow it to drain out more quickly.

Engage the emergency / parking brake and place wheel chocks on both sides of the rear wheels to prevent the car from moving.

Open the hood, twist off the oil filler cap in the counterclockwise direction and lift up the dipstick handle an inch or two.

Removing the oil filler cap and lifting up the dipstick handle will help prevent a vacuum from forming and allow the old oil to drain out more quickly.

Carefully raise the front of the vehicle with the floor jack and securely support it with at least two jack stands.

Slide under the front passenger side of the engine bay with the Phillips head screwdriver (or an 8mm socket with a 1/4" drive ratchet) and a flathead screwdriver (or a pop rivet removal tool).

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Loosen Counterclockwise
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Remove 2nd 8mm Screw
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Pry Out Center of Fastener
Locate the oddly shaped plastic service cover on the underside of the skid plate.

Remove the two screws by turning them counterclockwise with a Phillips head screwdriver (or an 8mm socket).

Then pry out the center part of the two plastic pop rivets.

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Remove Plastic Pop Rivet
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Remove 2 Pop Rivets
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Service Panel Removed
Then pull out the base of the pop rivet fasteners.

Set the two screws and the two pop rivets aside in a safe place.

Pull off the service cover to access the oil pan, drain bolt and old oil filter.

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Oil Pan, Drain Bolt & Filter
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Rear of Oil Pan
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8mm Hex Drain Bolt
Set the service cover aside in a safe place.

Locate the black metal oil drain bolt on the oil pan.

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Loosen Counterclockwise
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Drain Out Old Oil
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Replace Oil Drain Bolt
Slide the used oil catch basin to just below the drain bolt.

Use an 8mm hex head socket and a 3/8" drive ratchet or an 8mm Allen key wrench to loosen the oil drain bolt in the counterclockwise direction.

Be careful when you remove the oil drain bolt. The old oil might still be hot enough to burn your fingers depending on how long you warmed up the engine.

Allow the old oil to drain out for at least a few minutes or until the flow slows down to just an occasional drip.

Spin in the oil drain bolt by hand a few turns in the clockwise direction to make sure it doesn't become cross threaded.

Tighten the oil drain bolt in the clockwise direction with the 8mm hex head socket or 8mm Allen key wrench to just past hand tight or about 25 lb-ft of torque.



 

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Twist Off Old Oil Filter
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Dip Finger In New Oil
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Lubricate Rubber O-Ring
Slide the used oil catch container to just below the old oil filter.

Twist off the old oil filter in the counterclockwise direction.

If you have trouble loosening the old oil filter, I recommend using a Lisle 63600 oil filter wrench attached to a short extension bar and a 3/8" drive ratchet.

Allow the old oil to drain out from the oil filter receptacle for at least a few minutes.

Dip your pinky finger in to some new oil and lubricate the rubber o-ring gasket on the new oil filter.

Lubricating the o-ring on the new oil filter will allow it form a better seal, prevent oil leaks and also make it easier to remove during the next oil change.

I recommend buying the Mobil 1 M1-108 oil filter since it has excellent reviews on Amazon.

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Twist On New Oil Filter
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Pop Rivets & Screws
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Re-Insert Access Cover
Make sure that the rubber o-ring from the old oil filter is not still attached to the engine.

Twist on the new oil filter in the clockwise direction to about 1/3 to 2/3 turn past hand tight.

Double check that the drain bolt and new oil filter are tight before moving on to the next steps.

Slide the plastic service cover back in to place on the engine splash guard.

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Push In Pop Rivets
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Tighten Clockwise
Re-insert the two pop rivets and push in the center pieces to secure them in place.

Re-insert the two screws and tighten them in the clockwise direction with the Phillips head screwdriver or an 8mm socket with a 1/4" drive ratchet.

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Replace 2nd Screw
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Service Cover Replaced
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Lower Car From Stands
Double check that the two screws and two pop rivets are securely in place.

Carefully lower the car from the jack stands by using the floor jack.

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Insert Automotive Funnel
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Pour In New SAE 0W-20
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Replace Oil Filler Cap
Insert the plastic automotive funnel in to the oil filler hole.

The oil capacity specification for the SKYACTIV-G DOHC 16V VVT 2.5L I4 engine for an oil change with a filter replacement is 4.8 U.S. quarts (or 4.5 liters).

I recommend only pouring in about 4 to 4.5 U.S. quarts of new SAE 0W-20 oil at first.

It is far better to have slightly less oil than necessary in an engine than to over fill it.

Running an engine that has been over filled with oil can lead to sluggish performance, cause damage to seals, gaskets or other components.

Temporarily replace the oil filler cap by twisting it on in the clockwise directions.

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Check Dipstick Oil Level
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Replace Dipstick
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Oil Change Complete
Start the engine and allow it to warm up for a minute or two.

Turn off the ignition and allow the new oil to drain down to the oil pan for at least 5 to 10 minutes.

Pull out the dipstick, wipe it clean with a paper towel, re-insert it and pull it out again to check the oil level.

If necessary, slowly pour in more oil and repeatedly check the level on the dipstick until it reaches just at or below the upper metal hole in the tip which indicates the "Full" or "Maximum" line.

You might not need to pour in the entire 4.8 U.S. quarts (4.5L) of new oil in order to reach the "MAX" line on the dipstick.

Tighten the oil filler cap in the clockwise direction until it is snug and push the dipstick down in to place.

To reset the oil life meter or maintenance reminder (indicated by the wrench icon on the instrument cluster), follow these steps: 1. Press and hold the "Trip" button with the ignition switched to "Off". 2. Turn the ignition switch to the "On" position. 3. Continue holding the "Trip" button for at least 5 seconds. The master warning light will flash for a few seconds when the oil life reset has been completed.

If your car has the Maintenance Monitor system, follow these steps: 1. Choose the "A" icon on the home screen to display the "Applications" menu. 2. Select "Maintenance" to view the maintenance list. 3. Switch the tabs until you select the Reset screen. 4. Reset the oil life meter.

Be sure to record the oil change in your car's service records. It would also be a good idea to watch your driveway, parking spot or garage for fresh drops of oil which might indicate a leak from the oil filter or the drain bolt.

For more, check out my other 2014-2018 Mazda Mazda6 DIY Repair & Maintenance Guides.
 

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