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Oil change on 2.5L engine

319K views 65 replies 39 participants last post by  kms1990  
#1 · (Edited)
Note: This is for the 2.5 engine.

Changing your engine oil is one of the most basic ways you can ensure your car engine is well maintained. If you have never changed your oil, you can do it with basic tools and you will know that it has been done correctly.

You will need the tools shown in figure 1. Ok, well you will at least need some sort of 17mm wrench in order to get your drain plug bolt out. The rest you could probably do without (for instance, if you were stranded on a desert island without that other stuff and you were still planning to change your oil).

Figure 1:
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You will also need some new oil and a new filter (figure 2). (IMPORTANT NOTE: I bought 5 quarts. I believe your system capacity is 5 liters, which works out to about 5.3 quarts. Guess I have to get some more). I picked up mine at the local Autozone. I used Mobil1 5W-20. Another member (and fellow Buckeye fan) on here with the handle StitcH likes 5W-30. Either is probably fine, but your owners manual recommends 5W-20 so I'm gonna' use that. Also, note that if you're in Mexico and 5W-20 isn't available, they want you to use 5W-30 (figure 3).

If you have a 2011:
Might be good to note in the original post that the 2011 MZ3 manufacturer recommendation is 0W-20....


Figure 2:
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Figure3:
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OK, now that you've scrounged up some tools and the necessary consumables for the job, lets get dirty!

Step 1: Locate your oil filter and drain plug. Figure 4 shows a picture I took from the front of the car. You can see my wrench hanging on the oil drain plug. The filter is located directly above the large cutout section of your plastic guard.

Figure 4:
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Step 2: Loosen your oil filter (figure 5). I like to loosen it a little bit, and then loosen my drain plug just so I know that I can get both loose. In this case, I think He-Man was working the assembly line and decided to tighten my filter EXTRA tight, so I would say many curse words and be very frustrated. I'm sure he had a good chuckle about that. I tried to loosen it with my bare hands to no avail. Then, I tried to use the oil filter wrench you saw back in figure 1, but it kept slipping and did not get a good grip on the filter. Finally, I got the idea to cram a rubber gardening glove in-between the filter and the wrench and I was able to get it off! My wife loved this feat of engineering.

Figure 5:
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Step 3: Loosen your drain plug bolt (figure 6). You will need your 17mm wrench for this part. I had some more curse words at this point. I thought it was also very tight. Then I realized I was trying to turn it clockwise. Remember folks: righty tighty, lefty loosey.

Figure 6:
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Try to capture all of your oil in a oil pan or something. When the filter comes off, your hand will probably get all oily. I probably should have mentioned that earlier, eh? :)

Figure 7: Success!
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Figure 8: When you take your drain plug out, make sure you locate the washer that was on it. You should probably use a new one of these each time you change your oil, but I didn't have any so I just reused the same one. I will get some at the dealership next time I drive by.
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Step 4: Your oil is drained and your filter is off. Put your drain plug back in and tighten it. How tight you ask? Whenever I ask someone that question, I always get the same answer: “Well, you don't want it coming off.” So there you have it. But you don't want it so tight that you strip the oil pan either.

Take your old filter and compare it to your new filter. They should look similar and have the same diameter (figure 9). If one is longer in length, that's OK too (figure 10). Make sure the rubber seal is still attached to your used oil filter and not stuck to your car. Open one of your oil containers, dip your finger in, and rub some clean oil around the rubber seal of your new filter (figure 11). Put your filter back on.

Figure 9:
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Figure 10:
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Figure 11:
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Note that your factory filter has FoMoCo printed on it. That stands for Ford Motor Company. Mazda and Ford worked together on this platform. You may also be wondering how I took the picture while holding a filter in each of my hands. Keep wondering. :)

Step 5: By this point you should have your filter back on and your drain plug replaced, too. Open your hood and locate your oil fill cap (figure 12). Take the cap off and put your funnel in. Add your oil (figure 13). Note that I am grasping the bottle using proper technique. This ensures that the oil will not “glug” as it exits the bottle. I put 1 bottle in, then look beneath the car just to make sure it's not all spilling out onto the garage floor (like you forgot to put the drain bolt back in).

Figure 12:
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Figure 13:
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Step 6: Put the rest of the oil in. Once you put about 5 liters in, put the cap back on and start your car. It's important to make sure that there isn't any oil coming out (check under your car). Also important, make sure you don't get any lights on the instrument panel. If your oil light comes on for any period of time, STOP YOUR ENGINE. It is imperative that you do not run your engine without oil. (I always carry an extra quart with me just in case I need to top it off). After you run your engine for a couple minutes, you can go ahead and check the oil level on your dipstick. It should be between the upper and lower limit.

That's it! Now you can kick back and enjoy a cold brew (or a coke if you're under 21). Be sure to dispose of oil properly, take it to an oil recycling center or your local auto parts store (should take it for free). You can now take comfort that your oil has been changed properly (insert sigh of relief). Note happy, smiley car.
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#2 ·
nice write-up for first-timers! a couple of extra notes that i like to do:

i like to use a different type of oil filter wrench. it's like a big set of pliars, and ensures that you won't have any slippage issues that you had. see picture

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i also remove the oil filler cap before i start to drain the oil, because it removes the vacuum created by the draining oil, and drains faster.
one last note: if you are going to change the oil yourself, keep a journal and keep your reciepts! when i told my dealership that i was going to change my own oil after my 2 complimentary oil changes they told me that i needed to keep all documentation of all work performed on my car. there was a guy that wasn't going to get a replacement motor under warranty b/c he couldn't provide proof that he actually changed his oil! it also helps when you're trying to sell your car because you have a detailed service record!
 
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#3 ·
Thanks for the write up and additional info guys. Its awesome that members take the time to share.
 
#6 ·
Thanks for the informative write up. Its a easy job, but the pictures and everything make it easier for the first timer. I usually get the oil filter wrenches to remove the oil filter. I think I have just about every size made over the years. lol
 
#7 ·
Thanks for the write up.

Easiest oil change ever. Usually the first oil change on a new vehicle for me is filled with lots of wondering where the darn engineers decided to hide the oil filter and then using every combination of four letter words I can think off while I struggle to get said filter off that some neanderthal at the factory tightened with a 3 foot breaker bar.
 
#13 ·
I just did mine a couple of weeks ago and used Mobil 1 0W-20 Advanced Fuel Economy FWIW.
 
#14 ·
hmmm...0W-20? Odd...my oil cap says 5W-20. might be time to change...
 
#16 · (Edited)
I recently took my 2011 Mazda 3 2.5 litre in also for its 2nd oil change at 5100 miles and the dealer put in castrol 5w-30 but said they used 0w-20 but the bill said 5w-30!! I was pissed and made them verify they used 0w-20 they showed me the bottles but anyone can pick up a bottle and say i put this in it, anyways i've never been a fan of castrol just my preference and my mileage went from 33mpg highway to 24.9mpg needless to say the dealership received a very irrate phone call from me in which I explained the situation and they apologized and offered free oil change i said no thanks, I switched back to
0w-20 Mobil One Advance Fuel Economy (not sure but I believe 0w-20 is only made in a synthetic, anyone know otherwise?)and mileage shot back up to 32.8mpg. I called Mazda and they too verified 0w-20 in the 2011.I took pictures of the oil the dealer service department slopped all over the underside of the car and never bothered to clean up and will be sending them to Mazda headquarters along with the appaling survey I gave them. I plan on keeping this car forever and don't believe it should be treated with blatent disregard. I did return to the dealer to fix the -15 degree toe in on the right front wheel after a tire rotation they did?? Never had a problem with anything before I took it in last saturday, needless to say it will never go back to the dealer and I have found a very reputable mechanic closer to where I work. Minus the dealer experience I absolutely love my 3 it reminds me of my old school '90 mx-6, that still runs today with 261k miles, to bad someone else owns the mx-6 now.
 
#17 ·
I use 0W-30 (Mobil One Advance Fuel Economy) in my 3 and it works just fine. I'm not sure what the hell they put in your car, but I'd be sending it off for testing.

As a side note, 5W-30 can be substituted (per the manual) if 5W-20 is not available. In Europe (if memory serves), they use 5W-30.
 
#18 ·
All the 2011 models except the speed version were switched to 0w-20, and 5w-20 SYN is used if 0w-20 cannot be uptained. Nothing has changed between the engines as far as i know. The switch in oil grade by Mazda is most likely to improve emissions and mpg. Just like Toyota did with their newer camry and prius. As for when to change the oil, 5000 for severe and 7500 for normal.
 
#19 ·
I wonder how Mazda is handling this with 2011 owners. So far, I've had three dealer oil changes, each time was around $32 before taxes with the coupon, which stipulates a surcharge for synthetic. Is it that 2011 owners can't avoid the surcharge, or are they getting synthetic for the same price I'm paying for non-synthetic? If so, I definitely expect the same treatment, since I have the same engine as they...
 
#22 · (Edited)
I registered on the official mymazda.com, specified my dealer. There are printable dealer-specific coupons there. I'm not sure how/why, but Mazda also e-mails me coupons from time to time. After taxes, it winds up being $37, but, I assume, the dealer also hits lube points and eyes things on the underside for problems, plus a free touchless auto wash, so it, meh, an OK deal.

I don't really want to pay more than about $30 (approx cost of 5qt motorcraft 5w-20 and mazda3 oil filter) for a change and if it gets too high, I will just do it myself, because I'm changing on the 'severe driving conditions' schedule of about once per 3000 miles (It's actually 10000km intervals for normal and 5000km intervals for severe, for recommended oil changes). I am observing the severe shedule for engine oil changes on account of dusty dirt roads and some pretty hardcore mountainous driving out here in the Denver foothills. Fortunately, I almost never short-cycle the engine, almost never drive less than 10 miles minimum. Everything out here is spread out... s'why I bought it Aug 3rd and am already approaching 8000 miles on the ODO. Probably overkill, but so far, I've gotten oil changes at 580 miles, 3400 miles, and 7100 miles.
 
#26 · (Edited)
I would never substitute 5w-30...
Sigh...

The reason Mazda "recommends" a 20 weight oil is because of Corporate Average Fuel Economy (CAFE). A 20 weight oil will yeild slightly higher fuel economy (emphasis on slightly - as in maybe 0.2 MPG). However, this is enough to help Mazda with their CAFE numbers so it is what they recommend. A 20 weight oil has a lower film strength than a comparable 30 weight and does not protect your engine as well. Mazda does not care about this because you won't see any effects of the 20 weight oil until after your powertrain warranty is up - but the effects will still come.

If you look in ANY other market that the 2.5L motor is offered apart from the US, Mazda recommends 30 weight. Seems odd that just the US would need the 20 weight, right?

The first part of the oil grade (5W or 0W) simply refers to the viscosity (thickness) of the oil when it is cold. The second number is the viscosity when it is at operating temperature. You really don't need a 0W oil unless you are in extremely cold conditions (i.e. northern Canada and Alaska). It isn't necessarily going to hurt if you are in a slightly more mild climate, but it is not necessary. It surprises me that Mazda recommends a 0W no matter where you live.
 
#24 ·
0w-20 is synthetic, and like most all synthetics, resists breaking down at the temperatures in your engine much better than fossil oils. It lubricates at cold startup sooner than 5w-20, and is a thinner oil than 5w-30. I have heard that the oil channels in the MZR L5-VE 2.5l engine are small, and so it's important to run the -20 weight oil for full lubrication in all operating conditions. While it's always best to go with what the oil cap / owner's manual says, the same engine in the 2010 MZ3 s Sport HB is spec'd for 5W-20, so it isn't the end of the world (and engine) if you run that, but I would never substitute 5w-30...
 
#28 ·
It is not. Most likely a synthetic blend.

Sigh...

The reason Mazda "recommends" a 20 weight oil is because of Corporate Average Fuel Economy (CAFE). A 20 weight oil will yeild slightly higher fuel economy (emphasis on slightly - as in maybe 0.2 MPG). However, this is enough to help Mazda with their CAFE numbers so it is what they recommend. A 20 weight oil has a lower film strength than a comparable 30 weight and does not protect your engine as well. Mazda does not care about this because you won't see any effects of the 20 weight oil until after your powertrain warranty is up - but the effects will still come.

If you look in ANY other market that the 2.5L motor is offered apart from the US, Mazda recommends 30 weight. Seems odd that just the US would need the 20 weight, right?
While all of this may be true, there are many high quality 20 weight oils that can protect and lubricate the engine just as well. I don't claim to know all there is to know about motor oil and different weights, but as long as a quality oil is used and in the range of approved weights, I don't see the problem with 0w20, 5w20, or 5w30. Used oil analysis show that these weights usually all work fine in many of today's engines, barring that there are no other problems with the engine.
 
#30 ·
I don't think using a full synthetic will hurt in any way. I purchased it in large quantity last fall, due to a $10 refund per 5 liter container (bringing it down to the price of regular oil). I figure I do drive in an environment with widely varying temps, plus I do drive in a more spirited fashion.

As for Europe, their service intervals are completely different from ours. Every 12,500 miles! Mazda - Mazda Service Schedule
 
#31 ·
the reason all car manufacturers are going for 5W-20 is because of fuel economy and the tolerances for these new engines are very tight due to recent advancements in machining processes... i would suggest using recommended oil because thicker oil might not lubricate the critical spots as well as thinner 5w-20...
 
#33 · (Edited)
Maybe it's just me but I can see 0-20 for the winter months but even 5-20 makes me nervous in a hot climate like Florida in the summer months. I just feel like Mazda is sacrificing engine longevity for this corporate mpg race that's going on between the car manufacturers.
 
#34 ·
Ok I have to chime in here, i've researched oil quite a bit since buying my 3, never have I come across such discrepencies in what oil to use. An excerpt from Bob is the Oil guy made alot of things clearer. I know these are based on a 30w oil but in reality a 20 weight oil may be slightly negative than the 30w so if 30w is 10 @ 212F then maybe 20w is 9.8. Oil viscosity to on the bottle has nothing to do with the viscosity at operating temperate as one can see. Yes it does when it's cold but in all reality how much of a difference in viscosity is there between 30w and 20w? I'd probably say a .2 or .3 in viscosity not enough to warrant a potential sludge problem from using a 5w-30. I'll go by recommendations from the manufacture. They know best. Go over to Bob is the oil guy and read Motor Oil 101. It clears up alot of things, including this discussion.

Mineral oil:

Oil type...Thickness at 75 F... at 212 F...at 302 F

Straight 30..........250....................10..........3
10W-30...............100....................10........ ..3
0W-30..........There are none in this range......



Synthetic oil:

Oil type...Thickness at 75 F... at 212 F...at 302 F

Straight 30...........100...................10...........3
10W-30.................75...................10........ ...3
0W-30...................40...................10...... .....3