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Mazda Mazda6 I4 2.3L Engine Oil Change Guide
A pictures illustrated instruction guide for changing the motor oil in a Mazda 6 with the 2.3 Liter four cylinder engine.

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2004 Mazda 6
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MZR 2.3 Liter 4 Cylinder
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Plastic Underbody Panel

This automotive how-to guide was specifically written to assist owners of the 2004 Mazda Mazda6 equipped with the MZR 2.3L I4 L3 DOHC engine in changing the motor oil and oil filter element.

Owners of other first generation Mazda 6 or "Atenza" vehicles from 2002 to 2008 should also find this guide to be useful. The procedure may be similar in additional Mazda vehicles such as the MX-5 Miata, Mazda5, Mazda2, Mazda3, RX-8, Tribute, CX-7 and CX-9.

To change the engine oil in a 2002-2008 Mazda 6 requires a 10mm socket, a 15mm socket, a ratcheting socket wrench, a 76mm oil filter wrench with 14 flutes, an oil catch container, a new oil filter element, an Allen wrench set, and about 4.25 quarts of 5W-20 motor oil.

The oil filter cartridge that I purchased is STP part # S9641, which cost $8.99. Other filters that will work include Purolator # PL15505 or L15505, Proline PPL15505, and Fram CH9641.

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Removing 10mm Bolts
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7 10mm Panel Bolts
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Underbody Panel Removed

First I raised up the Mazda 6 with a 2.5 ton floor jack and secured the vehicle off the ground with two floor jacks for extra safety. To access the oil filter cartridge housing and the oil drain bolt, you have to remove a large black plastic underbody panel. The panel is held in place by seven (7) ten millimeter (10mm) bolts. A few of the underbody panel bolts require a socket extension piece to reach.

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Oil Filter Cartridge Housing
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15mm Oil Drain Bolt
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Bottom of Oil Pan

Now that the underbody cover is out of the way, you'll be able to see the black plastic cover on the oil filter housing and the 15mm oil drain bolt on the rear end of the oil pan.

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Oil Catch Container In Place
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Remove 15mm Drain Bolt
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Old Oil Draining Out

The next step is to place the used oil catch container in place and remove the 15 mm oil drain bolt located at the rear of the oil pan facing the back end of the car. The oil will spray out a few inches, so be prepared to adjust the oil catch container if necessary. Allow the old oil to drain out for at least a few minutes, 15 to 30 minutes would be even better.

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New ProLine 5W-20 Oil
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STP Oil Filter S9641
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Oil Filter Housing Cover

While the old oil is draining out from the main oil drain bolt, remove the Allen key oil drain bolt located in the center of the oil filter housing cover.

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Allen Key Wrench Set
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Removing Oil Filter Drain Bolt
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Draining Oil Filter Housing

After a minute or two of letting the oil drain from the oil filter housing drain bolt, remove the oil filter housing cover by using the 76mm "14 Flute" cap type oil filter wrench attached to a regular ratcheting wrench handle. The 76mm socket only cost a few dollars at a local auto parts store, so I'd recommend purchasing one rather than struggling with out it.

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76mm Oil Filter Wrench
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76mm Tool On Ratcheting Wrench
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Removing Oil Filter Cover
Once the oil filter housing cover is loosened, twist it the rest of the way off by hand with the oil catch container underneath because some more oil will leak out.



 

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Oil Draining Out
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Oil Filter Cover Removed
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Oil Filter Receptacle

Remove the old paper oil filter element by pulling it straight off from the black plastic cage attached to the oil filter housing cover. Replace the old filter element with the new one by sliding it into place over the round plastic cage.

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Oil Filter Element Holder
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New Paper Oil Filter Element
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New Rubber O-Rings
The new STP oil filter element also came with a small rubber o-ring for the Allen key drain bolt and a large o-ring for the oil filter housing cover. Both original o-rings looked great, so I just saved the new ones for the future.
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Inserting New Oil Filter
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Screwing On Filter Housing Cap
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Tightening With 76mm Tool
Once the new oil filter element is securely in place, raise the oil filter housing cover into the oil filter receptacle and screw it into place by hand. Then tighten it with the 76mm oil filter wrench. If you have a torque wrench, use the torque setting printed on the oil filter housing cover. If you don't have a torque wrench, just tighten the cover about a 1/4 to 1/2 turn clockwise past hand tight. Don't over tighten the cover or you may crack the plastic and cause an oil leak.
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Re-Installing Filter Drain Bolt
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Allen Key Drain Bolt Secured
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Re-Installing Oil Drain Bolt
Next replace the Allen key oil filter housing drain bolt and tighten it 1/4 to 1/2 turn past hand tight. Then replace the 15mm oil drain bolt and again tighten it about 1/4 turn past hand tight. Don't over tighten the oil drain bolt or you may crack the oil pan.
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Tightening 15mm Drain Bolt
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Underbody Panel
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Re-Installing 10mm Bolts
Double check the 15mm oil drain bolt, 76mm oil filter housing cover, and the Allen key bolt in the center of the oil filter cover before re-attaching the underbody panel. To re-attach the underbody panel, use a 10mm socket with an extension piece. Be sure to insert the two plastic tabs near the rear of the car into the underside of the car before tightening any of the 7 10mm bolts.
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7 10mm Bolts - Underbody Panel
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SAE 5W-20 Oil Filler Cap
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Funnel In Oil Filler Hole

With all of the steps under the car completed, lower the car off the floor jack and jack stands. This 2004 Mazda 6 with the 2.3 liter inline 4 cylinder engine required about 4.25 quarts of 5W-20 oil. Check your owner's manual or consult with a professional mechanic if you have any doubts about how much oil your engine requires before proceeding. Using an automotive funnel, pour in 3.5 to 4 quarts of new 5W-20 oil and check the dipstick. Keep adding oil until the oil level on the dipstick reaches the "Max" or "Maximum" level at the upper of two holes in the dip stick. I used just over 4 and 1/4 quarts of oil to reach that mark.

Then run the engine for a few minutes, turn it off, let the oil settle for 5 to 15 minutes and check the oil level on the dipstick again. I'd also recommend checking the oil level again after your first trip and watching for oil drips on your driveway.

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Pouring In New 5W-20 Oil
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~ 4.25 Quarts @ $2.99/Each
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Check Oil Dipstick

For more of my automotive maintenance guides or product reviews, click on the following links: Mazda Mazda6 Cabin Air Filter Replacement Guide, WeatherTech FloorLiner Car Mats Review, Zaino Bros Show Car Polish Review, Headlight & Tail Light Condensation Solution Guide, Sunforce Solar Battery Maintainer Review, Corroded Car Battery Terminal Replacement Guide, Garmin Nuvi 260W Portable GPS Review, Automotive Interior Carpet Replacement Guide, Falken Ziex ZE-512 Tire Review, Buffing Old Faded Headlights, K&N Air Filter Cleaning Guide, Fuzion ZRi Tire Review, and the iPAQ HX4700 PDA & Garmin GPS system.
 

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