Transmission/Gear oils
Delo Syn ATF 668
ISOCLEAN® Certified Lubricants
Transmission/Gear oils
Delo Syn ATF 668
ISOCLEAN® Certified Lubricants

Delo Syn ATF 668 is a full synthetic transmission fluid specifically engineered for Allison heavy duty automatic truck and bus transmissions, 

and is officially approved and licensed by Allison for transmissions requiring TES 668™ and is backwards compatible with TES 295®, TES 389® and TES 468®1.

Commercial trucks
Off highway heavy duty
Product Benefits
Improved transmission performance allows smoother shifts at low speeds and over a wider temperature range.
Exceptional clutch operation across temperature variations and load sizes under extreme working conditions.
Longer Service Life and lower maintenance cost enabled by improved anti-wear protection, antioxidation and shear stability.
Delo Syn ATF 668 is approved by Allison Transmission® (approval number 668-10042020), for use in the following applications: • Specified for Allison 1000 Series™, 2000 Series™, 3000 Series™, 4000 Series™, H 40/50 EP™ and eGen Flex™ Series on-highway products • Next-generation of Allison transmissions that specify TES 668 fluids Recommended for use in equipment requiring a ZF TE ML 14B/C transmission fluid.
  • Delo Syn ATF 668 meets the needs, terms of warranty and policies of Allison Extended Transmission Coverages (ETC) with the following features:
  • It provides the same oil change/drain intervals as TES 295 fluids.
  • It has the same prognostic settings as TES 295 fluids.
  • It is recommended for the same oil temperature operating range as TES 295 fluids, and
  • It will not affect the transmission oil cooling, oil levels, calibrations, or any other aspects of the transmission installation.

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