Originally Posted By: tony1679
Crazyoildude - I hear this "it's all the same" talk all the time as well. I am definitely on your side on this. Here's a perfect example to back us up, let's put this in engine oil terminology:
All brands of engine oil are the exact same if they meet the GM Dexos 1 spec. WRONG! As we all know, anyone that believes ALL formulations of Dexos 1 are the EXACT same is a fool. So why should you or I believe this is true with ATF+4?
Because their licensing programs and requirements are different. even though both are run by the same CQA, the requirements themselves are set by their customers, GM and Chrysler, which are two different companies.
Dexos is just a spec. Slightly lower NOACK and a few other things. GM allows CQA to license anything that meets their standards. GM even said they'd license a group II if it met dexos requirements.
Chrysler is a lot more childish with their ATF+4 licensing. It's not just a spec to them. Chrysler requires not only a group III, but it has to be from SK, Shell, or Petro-Canada, and they only allow a specific add pack from Lubrizol.
In other words, no matter how much better it is, Chrysler will NOT license your ATF+4 if it's not those EXACT base stock and add packs. For example, Redline C+ is the best ATF for Chrysler transmissions, but they cannot get a license because it's not the group III base stock from one of the three suppliers mentioned above (Redline C+ uses a group V base stock).
Given the above information, you can probably infer why all licensed ATF+4 is the same, and why all licensed dexos is not.