Chevron's Delo 400 LE SAE 10W-30 oil, specifically formulated for new low emission engines using ULSD, has demonstrated an ability to provide fuel economy improvements over the more commonly used 15W-40 grade diesel oil. It showed a 1% fuel economy improvement over 15W-40 oils and a 0.5% fuel economy improvement over 5W-40 grade synthetic lubricants. The improvement is a result of Chevron's proprietary ISOSYN Technology which combines highly refined base oils with advanced additives to create products that rival synthetic lubricants in critical performance tests while maintaining costs similar to mineral-based oils.
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