The Canadian Oil Company, supplies DURADRIVE HD SYNTHETIC 668 which is the Global Factory Fill Automatic Transmission Fluid, for all Allison Transmission (TES 668 TM APPROVED)
Petro-Canada Lubricants met the challenge.
We created DURADRIVE HD SYNTHETIC 668, an ATF so advanced and protective, Allison chose to make it first fill u every TES 668 specified transmission that leaves the factory.
Duradrive HD Synthetic 668, is fully compatible with every Allison transmission that requires approved TES 295 fluid.
If you want your Allison transmission to perform the way Allison built it to perform and to last the way Allison built it to last, you don't have to change the factory components. And that includes the ATF.