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ss3011 · 03-06-2017, 08:36 PM

Dextron is a copyright owned by GM . If the bottle of ATF says Dextron then it meets the GM specs for that Dextron fluid . They are tested and approved by GM . The later versions of Dextron which is now Dex6 , is able to service earlier versions of Dextron . So there are companies that make synthetic versions of Dextron , and they offer all the benefits of synthetic oils . Also the fluid that is specified for Allison automatics is called TransMax and is synthetic . It is a very high quality fluid that meets Dextron specs and is made by Castrol .

03-06-2017, 08:36 PM	#3
ss3011 Senior Member Join Date: Feb 2002 Location: Southeast Michigan Posts: 909 Likes: 70 Liked 239 Times in 114 Posts	Re: Dextron III / IV or Synthetic ATF Dextron is a copyright owned by GM . If the bottle of ATF says Dextron then it meets the GM specs for that Dextron fluid . They are tested and approved by GM . The later versions of Dextron which is now Dex6 , is able to service earlier versions of Dextron . So there are companies that make synthetic versions of Dextron , and they offer all the benefits of synthetic oils . Also the fluid that is specified for Allison automatics is called TransMax and is synthetic . It is a very high quality fluid that meets Dextron specs and is made by Castrol .