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- ZEPHYRHILLS FL
Except for there fluid engineer that went to work for Allison admitted GM knew dex vi was NOT reverse compatible with older rubber/neoprene seals hence why he wrote the bulletin that Allison released regarding the S/N breakpoints regarding the switch to viton seals. It's quite obvious you've made up your mind on it, but you cannot change my mind as I have seen 1st hand the damage that dex vi has done to older seals, talked with other shoos who seen it, and read what the fluid engineer wrote in regards to it.No evidence to suggest DEX VI is harmful to seals. It's been widely used for years with many having no issues.
GM only came out with dex vi because the patent on dex iii was expiring. So they switched to a synthetic fluid of a thinner viscosity. And considering how much trouble most of these transmissions experience with fluid leaking past bushings due to uncoated bushings, why chance it with an even thinner fluid.