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Mark Ugrich · 03-07-2017, 02:58 PM

Dexron is licensed by G.M. Apparently to sell any dexron product the manufacturer must submit the blend and contents to G.M. for approval. From what I've read G.M. no longer monitors anything prior to dexron VI as dexron 6 supersedes all other dexron fluids.
I agree with Myron that the synthetics offer more protection against heat. The only draw back I've heard of is that in a high horsepower combination, the synthetic is so slick that it can allow the clutch plates to slip.If you plan to do a lot of towing I'd use the synthetic.

03-07-2017, 02:58 PM	#9
Mark Ugrich Member Join Date: May 2011 Location: Auburndale,Florida Posts: 203 Likes: 21 Liked 58 Times in 32 Posts	Re: Dextron III / IV or Synthetic ATF Dexron is licensed by G.M. Apparently to sell any dexron product the manufacturer must submit the blend and contents to G.M. for approval. From what I've read G.M. no longer monitors anything prior to dexron VI as dexron 6 supersedes all other dexron fluids. I agree with Myron that the synthetics offer more protection against heat. The only draw back I've heard of is that in a high horsepower combination, the synthetic is so slick that it can allow the clutch plates to slip.If you plan to do a lot of towing I'd use the synthetic.