Transmission fluid change without filter replacement

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13' CX-5 and 16' Mazda6 both Touring w/Tech/Bose
If the filter has enough material on it to cause blockage, that means you did not maintain your transmission properly and a drain/fill will simply increase the chances of breaking those little shavings free and getting them stuck in one of the transmissions many intricate passageways. This is why I recommend not to touch your transmission at all if you don't plan on changing the pan filter, because you're just going to have more problems.

^^this represents 1/2 of why you should not touch the tranny (if never serviced) past 100k miles. The other half is that the metal shavings (ARE) beneficial to the system.

Over time, Larger bits are stuck on magnet/filter. Smaller bits become crucial lubricant for moving friction parts (now with gaps due to metal shaving). When removing the fluid/filter you may:

-Agitate the Larger bits to cause clogging.
-Moving friction parts has these gaps which rely on small metal shavings. Not having small shavings means mechanical failure risk.
 

Humid Hummus

Banned
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2016 Mazda CX-5
^^this represents 1/2 of why you should not touch the tranny (if never serviced) past 100k miles. The other half is that the metal shavings (ARE) beneficial to the system.

Over time, Larger bits are stuck on magnet/filter. Smaller bits become crucial lubricant for moving friction parts (now with gaps due to metal shaving). When removing the fluid/filter you may:

-Agitate the Larger bits to cause clogging.
-Moving friction parts has these gaps which rely on small metal shavings. Not having small shavings means mechanical failure risk.

This only becomes an issue after about 150K+ miles. At 100K there really is no risk to change your transmission fluid and pan filter, as the transmission is not relying on those little metal bits for friction just yet. Better late than never. Ask me how I know...

If you are changing your pan filter by 125K or so, whatever leftover metal particles will get caught by the new magnet filter. This is why so many people advise against a simple drain/fill at this mileage, because those metal particles are much less likely to get caught by the old original filter.
 
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CX5 GT-R
This only becomes an issue after about 150K+ miles. At 100K there really is no risk to change your transmission fluid and pan filter, as the transmission is not relying on those little metal bits for friction just yet. Better late than never. Ask me how I know...

If you are changing your pan filter by 125K or so, whatever leftover metal particles will get caught by the new magnet filter. This is why so many people advise against a simple drain/fill at this mileage, because those metal particles are much less likely to get caught by the old original filter.

Well, at 110K is when I did my Infiniti, or rather when the dealer did. Drain and fill, with filter swap. 5K miles later, it was deader than dead. Torque converter, too.
 

yrwei52

2016 Mazda CX-5 GT AWD w/Tech Pkg
Contributor
:
Plano, Texas, USA
Incorrect. The transmission filter also has a magnet which traps metal shavings that break off from the transmission components. If you dropped your pan and looked at this filter after 60K, you'll be happy you did.
No, the ATF filter cartridge (#5) inside of SkyActiv-Drive transmission has only regular *paper* type filtering material. The magnet is built into the ATF pan.
5470202.gif


If the filter has enough material on it to cause blockage, that means you did not maintain your transmission properly and a drain/fill will simply increase the chances of breaking those little shavings free and getting them stuck in one of the transmissions many intricate passageways. This is why I recommend not to touch your transmission at all if you don't plan on changing the pan filter, because you're just going to have more problems.
No, the ATF, not like engine oil, is relative clean during its service life as the transmission is a *sealed* environment. The service life on this ATF cartridge is long and the metal shavings if any won*t get loose with drain-and-fill. Even if some larger shavings get loose they will get stopped by the filtering element again and won*t get into the passages of valve body. Metal shavings are heavier and most likely will stay at the bottom of the ATF pan and are kept there by the magnet.

Changing the ATF filter/cartridge during the ATF change is a good practice. But our SkyActiv-Drive ATF pan uses silicon sealer which is hard to apply properly, and the factory service manual mentions only drain-and-fill procedure, not with filter / cartridge change.
 
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CX5 GT-R
No, the ATF filter cartridge (#5) inside of SkyActiv-Drive transmission has only regular *paper* type filtering material. The magnet is built into the ATF pan.
5470202.gif


No, the ATF, not like engine oil, is relative clean during its service life as the transmission is a *sealed* environment. The service life on this ATF cartridge is long and the metal shavings if any won*t get loose with drain-and-fill. Even if some larger shavings get loose they will get stopped by the filtering element again and won*t get into the passages of valve body. Metal shavings are heavier and most likely will stay at the bottom of the ATF pan and are kept there by the magnet.

Changing the ATF filter/cartridge during the ATF change is a good practice. But our SkyActiv-Drive ATF pan uses silicon sealer which is hard to apply properly, and the factory service manual mentions only drain-and-fill procedure, not with filter / cartridge change.

It's not hard to apply properly at all. If your dealer says so, it's because they have inexperienced techs and do so few of them. Other brands do that every 30 to 50k miles without ever an issue.
 

shadonoz

SkyActiv Member
Contributor
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State of Jefferson
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2017 CX-5 GT AWD+
It's not hard to apply properly at all. If your dealer says so, it's because they have inexperienced techs and do so few of them. Other brands do that every 30 to 50k miles without ever an issue.

A great argument against a weekend warrior tackling the job.
 

yrwei52

2016 Mazda CX-5 GT AWD w/Tech Pkg
Contributor
:
Plano, Texas, USA
A great argument against a weekend warrior tackling the job.
Similar to a good caulking job, it definitely is not an easy job at least for me. You dont want to apply too much silicon sealant which may get squeezed out and fall into the ATF pan; too little may fail to have a good sealing function.
 

yrwei52

2016 Mazda CX-5 GT AWD w/Tech Pkg
Contributor
:
Plano, Texas, USA
My opinion on ATF change is the same as this Scotty Kilmer guy ⋯

 

Kedis82ZE8

'15 CX-5 GT AWD, '12 GX 460, '07 G35x
Contributor
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'15 CX-5 GT AWD
IMO... if you have enough metal to clog up that AT filter one has bigger issues than just bad fluid.

I'm gonna do my partial change really...really soon.. I'm still at around 45-46K miles.
 

yrwei52

2016 Mazda CX-5 GT AWD w/Tech Pkg
Contributor
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Plano, Texas, USA
IMO... if you have enough metal to clog up that AT filter one has bigger issues than just bad fluid.

I'm gonna do my partial change really...really soon.. I'm still at around 45-46K miles.
I agree.

I wouldnt worry too much to drain-and-fill the ATF at 46K miles. I plan to do mine after 50K miles.

Have you done anything on your small engine oil leak?
 

Kedis82ZE8

'15 CX-5 GT AWD, '12 GX 460, '07 G35x
Contributor
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'15 CX-5 GT AWD
I agree.

I wouldn*t worry too much to drain-and-fill the ATF at 46K miles. I plan to do mine after 50K miles.

Have you done anything on your small engine oil leak?

It has again apparently subsided for the summer but I'll report back if it appears more noticeable when I partial change AT fluid. Not forgotten :)
 

madar

Contributor
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2016.5 CX 5 Touring AWD, 2015 SCION XB
IMO... if you have enough metal to clog up that AT filter one has bigger issues than just bad fluid.

I'm gonna do my partial change really...really soon.. I'm still at around 45-46K miles.

Yep, if you have a clog the thing won't even run
 
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Mazda CX-5 AWD GT
Finally got around to the AT drain & refill at 103K miles. Drained fluid looked like strong coffee! Will repeat two more times with about 1K miles in between. Highway driving is about 65% of my miles. Definitely won't wait so long on any future car with "lifetime" fluid. Transmission seems to shift more smoothly, but could just be me. Wasn't experiencing any issues previously just trying to get the most miles on this vehicle as possible.
 

yrwei52

2016 Mazda CX-5 GT AWD w/Tech Pkg
Contributor
:
Plano, Texas, USA
Finally got around to the AT drain & refill at 103K miles. Drained fluid looked like strong coffee! Will repeat two more times with about 1K miles in between. Highway driving is about 65% of my miles. Definitely won't wait so long on any future car with "lifetime" fluid. Transmission seems to shift more smoothly, but could just be me. Wasn't experiencing any issues previously just trying to get the most miles on this vehicle as possible.
Great to have enough courage doing the first ATF drain-and-fill at 103K miles! Honestly Id do the same no matter what. Hope you have nothing but good results from your ATF change. One thing I wouldnt do is to wait for 1K miles for the next 2 changes. The fresh and old ATF will be fixed immediately by the ATF pump. Id wait for a week or two, or a couple hundreds of miles in between to do the subsequent ATF changes. I imagine you used only genuine Mazda ATF FZ, nothing else. :)