The DuraDrive HD Synthetic Blend Automatic Transmission Fluid from Petro-Canada Lubricants is formulated to perform under the demanding severe service operating conditions found in heavy duty transmission systems. It is approved for extended drain application in Voith and ZF commercial transmissions. DuraDrive HD ATF is formulated with HT Purity Process 99.9 percent pure base oils. The combination of Purity base oils and additive systems in DuraDrive HD ATF formulations helps retain their fresh oil properties longer resulting in superior product performance, says the company. The ATF prevents corrosion and the formation of harmful sludge and deposits, as well as delivers quick lubrication of transmission components in cold weather. It also reduces wear on bearings, bushings, and gears.