You can see those licensed fluids on the Allison website as well. Of note, you will see that Mobil's ATF meets that spec and is licensed. You can find a list of licensed fluids on Allison's site.Īllison also created a new fluid spec (called TES-389) that licenses non-synthetic fluids that have appropriately compatible chemistry packages. That spec is a very demanding performance based spec that can basically only be met with good additive packages and PAO basestocks. But there are other approved, licensed fluids that meet that spec. Regarding your specific tranny, I suspect that the factory fill from Allison was indeed a TES-295 fluid (likely Transynd by Castrol). So, there is a long, mixed history about what is "approved" and what was "approved". Allison stood alone, then they were bought by GM, then sold. You need to be much more specific about your fluids that you are referring to, so we can give you specific answers.Ī little background. It is merely akin to using a standard dino fluid when topping off any other sump full of PAO based product spec'd for the same use. So, simply topping off with a DEX/Merc fluid is not going to be a catastrophic event in your case. TES-295 fluids are merely the pinnical of what would essentially be DEX/Merc fluids. However, I will acknowledge and state that once licensing has ceased, there is no garauntee of performance any longer you are relying on the good intent of the lube manufacturer at that point, rather then the intent of the OEM specs.įurther, TES-295 fluids like Transynd are actually constructed to work in the same environment as the former Dexron III and Mercon places. You would be safe as long as you choose from a reputable large name brand. But the aftermarket offers many viable fluids that mimic those old standards. Because they are no longer licensed, those full product names cannot be used. It is important to know that GM no longer licenses "Dexron III" and Ford no longer licenses "Mercon" that is why you see "D3/M" or "Dex/Merc" or some other variation of those terms. Mercon, Mercon V, Mercon LV, Mercon SP, etc. and the current tranny fluid from GM is Dexron VI). Not that I've have any experience with heavy-duty trannies or big rigs/buses.ĭexron is simply a brand name for a range of products from GM (former fluids were Dexron, Dexron II, III, etc. If it's low, it will blink out oL Lo ox where x=number of quarts low. The LCD will blink out oL oK if the fluid level's fine. And it's child's play to check fluid on the push-button shift Allisons, I showed a bus driver how by pressing the UP and DOWN arrows at the same time. I'd stick with the TranSynd/Delvac ATF in the Allison. But, this is a 2009 Allison 3000 RTD 6-speed automatic. I know the older Allisons it was perfectly alright to put Dexron in. My question is will putting the Dexron in the tranny harm it in anyway? The damage if any has already been done because my coworker took the advice of one of the so called mechanics and and put Dexron/Mercon in the tranny. Just goes to show noone where I work ever looks at actual factory manuals. I know for a fact since 2007 that Allison has been putting Allison/Castrol Transynd in their transmissions. Sure enough someone took it upon themself to handprint DEXRON III. The mechanical inspector replied, its in the service book in the truck. My supervisor was in the room and asked what fluid the transmission takes. Inspector said that my truck was several quarts low on a/t fluid. The head mechanical inspector came by our shop today to inspect our equipment.
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