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DuraDrive HD Synthetic 668 ATF | TES 668 Allison Transmission Fluid

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SKU: Duradrive1

   NOTICE : 2021 Product Release - Currently Not Available for Purchase

Coming Soon


The Allison automatic transmission found in your Duramax diesel pickup truck is a great transmission, widely regarded as one of if not the best transmission used in a 3/4- or 1-ton diesel pickup. The complex internal components of the transmission require transmission fluid (ATF) that is specifically designed and optimized to work with the clutches, gears, bearings and bushings to deliver peak performance while also protecting the components and providing longevity. Allison Transmission has recommended that customers use TES 295 rated fluids in their transmissions such as the popular TranSynd fluid that we at Merchant Automotive have been recommending for years. But starting in 2021 that recommendation will change to TES 668 rated fluids.



Excellent Resistance to Thermal & Oxidative Breakdown

  •        Keeps transmissions clean and functional by preventing corrosion and the formation of harmful sludge and deposits
  •        Suitable for extended drain and severe service


Remarkable Temperature Fluidity Both High & Low

  •        Provides quick lubrication of internal transmission components even in extreme cold weather
  •        Smooth gear shifting and earlier drive away in low temperatures
  •        Maintains oil film strength and desired viscosity even in high temperature operation
  •        Efficient heat removal from clutch surfaces
  •        Extends clutch material life
  •        Superb high and low temperature properties


Outstanding Anti-Wear Protection

  •        Safeguards clutches from glazing
  •        Fit for high operating temperature and heavy loading
  •        Reduces wear on gears, bushings, and bearings


Stable Friction Properties

  •        Excellent shift quality throughout service life of fluid
  •        Avoids clutch slippage and wear with high torque capacity
  •        Clutch bands and plates last longer
  •        Inhibits clutch shudder in modulated torque converters
  •        Maintains fuel economy and transmission efficiency
  •        Suitable for stop/start severe service


Compatible with seal materials in all Allison transmissions

  •       Maintains seal integrity





If you are looking for the best ATF for your Allison transmission DuraDrive HD Synthetic 668 ATF from Petro-Canada is the stuff for you. We will have it available here on the MA website as soon as it is available, in the meantime you can still purchase TranSynd or CAM2 Dexron VI ATF for your Allison transmission, they are still full synthetic fluids and we have had great results with both fluids in our MAximum Transmissions.


Allison Transmission recommended ATF for all Allison transmissions that were previously specified for TES 295 ATF.

Allison 1000 and Allison 2000 Transmissions


2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019

2500HD 3500 Silverado Sierra 6.6L V8 Duramax diesel and V8 8.1L gas engines:

LB7, LLY, LBZ, LML, LMM, L5P, 8.1L

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