Lower-viscosity oils reduce the amount of energy required to keep engine components in motion, which lowers fuel consumption. Using the average yearly mileage, oil change intervals, and miles per gallon, let’s look at two examples:
Switch from conventional 15W-40 to synthetic 10W-30
SAVE $81 a year per truck
2013 Ram 2500 HD
16,550 miles per year • 7,500-mile oil change intervals • 15 mpg
Source: CarInsurance.com, Fuelly, Diesel Hub
Switch from conventional 15W-40 to synthetic 10W-30
SAVE $869 a year per truck
2009 Peterbilt
121,500 miles per year • 25,000-mile oil change intervals • 10 mpg
Source: CarInsurance.com, Fuelly, Diesel Hub
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