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Old 01-31-2013, 03:57 PM   #1
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Where's the cheapest synthetic Dexron III transmission fluid??

So I've got to replace 20+ qts of Dexron III transmission fluid. I want to use synthetic oil.

Anyone have feedback of prices from recent purchases of 5 gallons of synthetic DexIII?

Appreciate any leads.
Thanks.
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Old 01-31-2013, 04:39 PM   #2
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Tractor Supply or Northern Tool
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Old 01-31-2013, 05:31 PM   #3
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If you are going to use synthetic, you should really go with Transynd or other TES295 fluid. Dexron III is no longer licensed by GM and so the specification is no longer meaningful. Transynd is about $55/ gal at a big truck dealer.
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Old 01-31-2013, 05:49 PM   #4
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Tractor Supply or Northern Tool

?? Do either of them carry a synthetic trans oil? Can't find it on line. Do they carry it, but not on -line?
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Old 01-31-2013, 05:59 PM   #5
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They have it at our location. We have a lot of construction and farm equipment here so it may just be the area.
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Old 01-31-2013, 06:26 PM   #6
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I 2nd the recommendation to upgrade your fluid from Dextron III. DIII is an outdated spec that is no longer enforced. What it says ON the bottle might not be whats IN the bottle. Mobil 1 Synthetic ATF is one compatible fluid that is also synthetic.

Is New Formulation Mobil 1 Synthetic ATF Usable for Applications Requiring Dexron III?
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Old 01-31-2013, 06:33 PM   #7
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I don't believe their is a synthetic Dexron III, it is dino fluid.
The synthetic fluid for Allison auto transmissions is TES295 which as already stated is much more expensive. If you currently have Dexron III in the transmission and want to change to synthetic to do it properly requires changing it twice to get all the old Dex III out. Here is a link to a thread started by the engineer from Allison that was responsible for the fluid in their transmissions; it's long but there is a lot of very good information in it.

Former Allison Transmission Fluids Engineer

Here is a link to his fluid testing company: http://www.jglubricantservices.com/


It would probably be a good idea to get your fluid tested before replacing it; you may not need it replaced. I hope this helps.

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Old 01-31-2013, 10:53 PM   #8
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I ask....why with this lawsuit happy world would any reputable oil company false advertise on their labels?

Just because GM doesn't license the oil any longer means the oil companies changed formulas and put false labels on the containers?
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Old 01-31-2013, 11:06 PM   #9
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I ask....why with this lawsuit happy world would any reputable oil company false advertise on their labels?

Just because GM doesn't license the oil any longer means the oil companies changed formulas and put false labels on the containers?
Ask Amsoil why they continue to mislead people.
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Old 01-31-2013, 11:18 PM   #10
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I ask....why with this lawsuit happy world would any reputable oil company false advertise on their labels?

Just because GM doesn't license the oil any longer means the oil companies changed formulas and put false labels on the containers?
Doesnt mean they are false, per say. Just that the Dextron III spec is no longer used and no longer enforced, so the actual oil may be 'close enough to Dextron III'..
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Old 02-01-2013, 11:13 AM   #11
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Since GM withdrew the license, the atf container often does not say DEXRON III. It lists, "compatable", "may be used in vehicles requiring" or "suitable for GM vehicles prior to 2006".
Allision has a program to license atf products that are tested to meet all the original Dexron III specs. These products come under TES 389. The requirements and licensed products are listed here.
Allison Transmission
The recommended Transynd fluids (TES 295) are synthetic and allow longer time between fluid changes.

C-4 and DEXRON-VI fluids are no longer approved by Allison and the DEXRON VI could cause seal problems in older Allison transmissions. (prior to 2007??)
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Old 02-01-2013, 12:43 PM   #12
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"Doesnt mean they are false, per say. Just that the Dextron III spec is no longer used and no longer enforced, so the actual oil may be 'close enough to Dextron III'.. "

Dextron? There is no such thing as Dextron
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Old 02-02-2013, 07:11 PM   #13
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"Doesnt mean they are false, per say. Just that the Dextron III spec is no longer used and no longer enforced, so the actual oil may be 'close enough to Dextron III'.. "

Dextron? There is no such thing as Dextron
Wait::::
Dextron is a drug, has 40000 wt Dextran in it. Dextron - Drugs.com
Does not improve shifting or time between changes
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Old 02-11-2013, 07:16 PM   #14
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So I've got to replace 20+ qts of Dexron III transmission fluid. I want to use synthetic oil.

Anyone have feedback of prices from recent purchases of 5 gallons of synthetic DexIII?

Appreciate any leads.
Thanks.
Baloo,

Use TranSynd or one of the other fluids approved under Allison's TES-295 specification. DEXRON-III fluids are unlicensed products and are not recommended by Allison. You could also use an approved TES-389 fluid but you'll have to change it way more often than TranSynd. TranSynd is virtually "fill for life" in an RV.

PS: I wrote the Allison TES-389 and TES-295 specifications.

Link to Allison TES-389 approved fluids list: https://fdlrd.swri.org/Allison/Appro...List.aspx?Id=2

Link to Allison TES-295 approved fluids list: Allison Transmission
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