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Old 12-28-2015, 08:03 PM   #15
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Originally Posted by Mr_D View Post
GM no longer tests nor approves Dexron III fluids so you have no way of knowing what you're buying.
Mr_D is exactly right. Saying a fluid is Dexron III or Dexron III "compatible" does not make it so, and since GM no longer licenses a product by that name, there is nobody watching the henhouse.
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Old 12-29-2015, 10:04 AM   #16
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Not true if it's going in an Allison trans. The seals in the Allisons are NOT compatible with Dexron (no "t" in the name) IV and possibly not V.
Sorry, I meant Dexron II, III and VI (produced by Vavoline) are fully compatible with Allison transmissions. The vast majority of the MH Allison trans used III for the last 40 years (or longer) up to around 2005 or so.
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Old 12-29-2015, 10:38 AM   #17
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Synthetic, e.g. Transynd or Delvac, or not, is not really related to the Dexron III question. However, Transynd is rated (by Castrol) to be Dexron III compliant, so it should be safe to use in any application that calls for Dexron III.

See: http://msdspds.castrol.com/bpglis/FusionPDS.nsf/Files/9C10295EDD368D3680257AA900531905/$File/Castrol_Transynd_2710.pdf
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Old 12-29-2015, 02:13 PM   #18
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Thanks for all the replies. I remember when I switched to transynd a few years ago , on the first oil change the transynd and dexronIII lived happily together. So I think I will go with transynd in the hydraulic system. transynd may be expensive but it won't look like it next to a repair bill.
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Old 12-29-2015, 04:03 PM   #19
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Sorry, I meant Dexron II, III and VI (produced by Vavoline) are fully compatible with Allison transmissions. The vast majority of the MH Allison trans used III for the last 40 years (or longer) up to around 2005 or so.
Sorry, but you are mistaken about Dexron VI.

Allison issued a bulletin specifically warning AGAINST using Dexron VI (a GM licensed product) in older Allison trannies which previously used Dexron III. Allison went so far as to state the SN of their trannies (and where they were produced) that had been upgraded to a new seal material that would NOT be damaged by Dexron VI. Allison continues to support the use of TES-295 certified fluids (same as TranSynd) from several oil brands, but Dexron VI is not one of them.
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Old 12-29-2015, 04:04 PM   #20
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Thanks for all the replies. I remember when I switched to transynd a few years ago , on the first oil change the transynd and dexronIII lived happily together. So I think I will go with transynd in the hydraulic system. transynd may be expensive but it won't look like it next to a repair bill.
Smart decision.
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Old 12-29-2015, 04:26 PM   #21
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Sorry, but you are mistaken about Dexron VI.

Allison issued a bulletin specifically warning AGAINST using Dexron VI (a GM licensed product) in older Allison trannies which previously used Dexron III. Allison went so far as to state the SN of their trannies (and where they were produced) that had been upgraded to a new seal material that would NOT be damaged by Dexron VI. Allison continues to support the use of TES-295 certified fluids (same as TranSynd) from several oil brands, but Dexron VI is not one of them.
It took me a while to find it, but here is the info confirming Allison's warning about Dexron VI (Dex 6) should NOT being used in older trannies:

<quote> Dex 6 can only be used with transmissions built after the below. The older units either have to find DEX 3 or convert to Transynd. What I attached is from an SIL 10TR 99 that is on Allison Transmission.com under fluid recommendation

DEXRON-VI use is restricted to transmissions with serial numbers greater than the following:
1000/2000 Product Families: 6310670488
3000 Product Family: 6510717281 (Indianapolis), 6520083093 (Hungary)
4000 Product Family: 6610220990 (Indianapolis), xxxxxxxxxx (Hungary)
DEXRON -VI is prohibited from use in AT/MT/HT Series transmissions.
(3) Military specification fluids are for use in
Military Use Only
and are strictly prohibited from use in 1000 and
2000 Product Families transmission products.
(4) Fluid and filter change intervals are based on transmission model, vocation (duty cycle), and fluid type (see attached
charts). NOTE: TES 295 drain intervals are based on 100 percent fill with TES 295 fluid. Fluid change intervals may be adjusted based on fluid analysis and fleet data. Refer to Service Information Letter 17-TR-96 for details.
<end quote>

So, you can take it or leave it, but that was direct from Allison in 2007.
Ed
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Old 12-29-2015, 05:01 PM   #22
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There are TES295 fluids that are cheaper than TranSynd. Mobil Delvac which was installed at the factory in my coach is one of them.
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Old 12-30-2015, 06:40 AM   #23
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Freightliner Custom Chassis uses Mobil Delvac as the factory fill for the Allisons they install, so many Allisons don't have Transynd anyway.
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Old 12-30-2015, 07:33 AM   #24
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Quote:
Originally Posted by Gary RVRoamer View Post
Freightliner Custom Chassis uses Mobil Delvac as the factory fill for the Allisons they install, so many Allisons don't have Transynd anyway.
Mobil Delvac is a TES 295 fluid which means that it is the "equivalent" of Transynd and the same change frequencies should be used.
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Old 12-30-2015, 07:52 AM   #25
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Originally Posted by deandec View Post
I changed my DIII to Transynd.
Did not see any additional benefit for the premium paid.
Oil analysis says tranny wear is fine so the DIII did no damage.
Would like to get that premium price for Transynd back.
Transynd will run cooler then DIII.
At least it does by my VMSpc after changing to Transynd.

Also using the DIII in a Allison it is recommended to change the fluid yearly.
Using Transynd the change recommended at 4 years.

That should get some of your premium price back.
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Old 01-02-2016, 01:50 PM   #26
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Let me know if you need any help from me on this subject.
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