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Mechanical Maintenance (Oil, Fluids, Break-In, Servicing) Everything related to the mechanical maintenance of the FR-S and BRZ


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Old 08-21-2019, 08:42 AM   #1
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How much ATF should be changed at main service?

I'm taking my 2013 GT86 AT in for its 6-year main service at a dealership tomorrow. In the quote they specified 2L of auto transmission fluid. I asked them if that was correct, as it sounded very little compared to the 7.5L total capacity. They confirmed that it was standard procedure to change only 2L.

Does this sound right to you guys?
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Old 08-21-2019, 11:20 AM   #2
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They are probably just doing a drain and fill, not a full flush with that little fluid
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Old 08-21-2019, 03:42 PM   #3
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I'm not sure what is specified, but personally I'd want to do a full 7L, which is what I do each time I change my ATF. It is more work since you can only do about 2L at a time and must row the gears to get fluid exchange to occur. They can pressure flush it, but I advise against that as it can damage the internals. Since your car is 6 years old and is out of warranty, you should consider doing the service yourself at home. I made a thread in the DIY forum on how to do this, it's a bit time consuming but pretty straightforward.
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Old 08-25-2019, 06:49 AM   #4
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http://www.ft86club.com/forums/showthread.php?t=8374

Page 140-142 of the PDF linked above. 2L is spec for a standard drain and fill service.
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Old 08-26-2019, 09:56 AM   #5
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I think a 2L drain and fill every 15-20k miles would probably be fine. At 60-80k a full 7.5L drain and fill (but specifically not a flush) would be advised.
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Old 08-26-2019, 11:43 AM   #6
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I think a 2L drain and fill every 15-20k miles would probably be fine. At 60-80k a full 7.5L flush would be advised.
3-4 drain and fills, NOT a flush
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Old 08-26-2019, 02:15 PM   #7
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3-4 drain and fills, NOT a flush
True, if you want to be unnecessarily technical about it.
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Old 08-27-2019, 07:24 PM   #8
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True, if you want to be unnecessarily technical about it.
Except that being technical in this situation is entirely necessary. Flushing the transmission is used by many shops and other people in the industry to imply forcefully extracting transmission fluid followed by a complete fill. Some transmissions can handle this procedure, assuming it is done correctly. But there is plenty of evidence, anecdotal and systematic, that power flushing can lead to additional damage and even destruction of many transmissions.

In general, and especially for low mileage (under 200k) transmissions, the risk of sludge being left behind with just a drain and fill is way lower than the risk of damage to the transmission with a power/vacuum flush. Therefore, lots of shops and other professionals strongly recommend sequential drain and fills, either all at once or over time (say, 2 L once every 20-30k).
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Old 08-27-2019, 07:45 PM   #9
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Except that being technical in this situation is entirely necessary. Flushing the transmission is used by many shops and other people in the industry to imply forcefully extracting transmission fluid followed by a complete fill. Some transmissions can handle this procedure, assuming it is done correctly. But there is plenty of evidence, anecdotal and systematic, that power flushing can lead to additional damage and even destruction of many transmissions.

In general, and especially for low mileage (under 200k) transmissions, the risk of sludge being left behind with just a drain and fill is way lower than the risk of damage to the transmission with a power/vacuum flush. Therefore, lots of shops and other professionals strongly recommend sequential drain and fills, either all at once or over time (say, 2 L once every 20-30k).
Definition of Flush - “cause (a liquid) to flow through something”
I am causing 7.5L (of ATF) to flow through my transmission in order to flush it.
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Old 08-27-2019, 07:57 PM   #10
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Definition of Flush - “cause (a liquid) to flow through something”
I am causing 7.5L (of ATF) to flow through my transmission in order to flush it.
You are correct when using Merriam-Webster and even probably in many other industries and professions. Unfortunately, the auto repair industry has co-opted that word to indicate use of a power/vacuum-assisted machine that (typically) hooks up to the transmission cooler lines. Lots of people assume that this is what is happening when you ask for a "transmission flush service." Since that service can harm many transmissions, it is important to clarify this for people, especially since many people use forums like this to learn about stuff. The last thing any of us want is for someone to harm their car because they misunderstood something that isn't entirely obvious (as it uses what amounts to an industry colloquialism).
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Old 08-27-2019, 08:06 PM   #11
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You are correct when using Merriam-Webster and even probably in many other industries and professions. Unfortunately, the auto repair industry has co-opted that word to indicate use of a power/vacuum-assisted machine that (typically) hooks up to the transmission cooler lines. Lots of people assume that this is what is happening when you ask for a "transmission flush service." Since that service can harm many transmissions, it is important to clarify this for people, especially since many people use forums like this to learn about stuff. The last thing any of us want is for someone to harm their car because they misunderstood something that isn't entirely obvious (as it uses what amounts to an industry colloquialism).
Ok corrected it.
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