Allison Transmission TES 668® introduces the next generation of synthetic automatic transmission fluids for long-haul applications. TES 668 builds on the proven 20-year history of TES 295® synthetic transmission fluid and offers the same outstanding performance with a modern additive package. TES 668's robust formulation meets the most demanding specifications for fluid stability, lubrication and cold operation.
Allison recommends TES 668 approved fluids to extend fluid change intervals and improve transmission performance and durability in all operating environments. Allison TES 668 approved fluids are recommended for use in Allison 1000 Series™, 2000 Series™, 3000 Series™, 4000 Series™, H 40/50 EP™ and eGen Flex™ on-highway products.