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This is the only synthetic fluid approved for the Allison transmission and has been specifically designed for Allison by Castrol. This fluid is highly recommended and compatible for all 2001-2019 Duramax diesel trucks with Allison transmissions. Dmaxstore has tested this fluid for years in our personal trucks and hundreds of customer trucks. The results are superior with noticeably improved and smoother shifts. There is no need to compromise or experiment with other fluids Transynd is the best choice for your Allison. Gears, bearings, bushings, clutches, thrustwashers and other components benefit from improved viscosity stability and cooler lube oil. Tests prove that TranSynd will outperform other oils on every level: Providing superior wear resistance Extending drain intervals Protecting other transmission components Resisting oxidation and sheardown Improving viscosity stability TranSynd heavy-duty automatic transmission fluid, a remarkable synthetic oil exclusively formulated by Castrol for Allison Automatics, extends Allison transmission oil drain intervals 300%. TranSynd's viscosity stability and resistance to thermal breakdown protect your Allison Automatic far better, far longer. And TranSynd is highly resistant to oxidation, minimizing chances for sludge and varnish deposits. You invested in Allison Automatics because you wanted your vehicles to be more productive, more profitable. TranSynd transmission fluid not only protects your investment, it improves its return. Natural limits: Conventional transmission fluids have performance additives blended in. Performance additives include friction modifiers, anti-wear agents, antioxidants, dispersants, detergents, rust/corrosion inhibitors, seal swellers, anti-foamants and more. These other oils undergo physical and chemical changes with extended use. Physical changes include sheardown- permanent viscosity loss.