Heavy-Duty Diesel Engine Oil helps increase fuel economy.

Full-synthetic, low-viscosity DURON™-E UHP 5W-30 minimizes sludge and piston top groove deposits to help maintain like-new engine conditions and subsequently promote fuel economy. Made up of 99.9% pure base oils, composition helps product maintain its properties longer and is important

[source: http://news.thomasnet.com/fullstory/Heavy-Duty-Diesel-Engine-Oil-helps-increase-fuel-economy-20037309]

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