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How the right motor oil can help improve fuel economy

Mobil gas station for Mobil 1™ Advanced Fuel Economy motor oil with vehicles parked
Over the last 15 years, modern automobile gasoline engines have been getting more and more efficient to meet the demands of government regulations for increased fuel economy. The use of lower viscosity oils can help support efficiency and help improve fuel economy by decreasing engine friction.

Where does that unused engine energy go?

There are four key areas in an engine where energy friction loss occurs:

1. The valvetrain
Energy loss occurs in the camshaft bearings and in the contact area between the valve and lifter.

2. The piston and cylinder
Energy loss occurs at the piston liner interface during the combustion cycle and especially before and after the midstroke.

3. The oil pump
In the oil pump, energy loss occurs due to rotational energy consumed by pumping heavier viscosity oils, particularly during warm-up. That’s why we’ve seen the trend of lower viscosity oils, such as 0W-30 and 0W-20.

4. The crankshaft
The main bearings and connecting rod bearings are two additional areas where friction occurs.

Switching from a higher viscosity oil to a Mobil 1™ Advanced Fuel Economy motor oil in a lower viscosity can help decrease engine friction, which in turn, can help improve fuel economy.*

Engine protection plus fuel economy
The low-friction formulations of Mobil 1 Advanced Fuel Economy fully synthetic motor oils increase engine efficiency and fuel economy versus those viscosity grades most commonly used.

How does this work? During warm-up, Mobil 1 Advanced Fuel Economy oil flows faster, because of its lower viscosity, which can minimize metal-to-metal contact to reduce friction and wear.

It also reduces friction at points of contact between the piston compression rings and cylinder walls. And during the warm-up phase, the Mobil 1™ fully synthetic formulation, because of its lower viscosity, flows more easily through the oil pump, requiring less energy to pump the oil to the critical engine parts.

Finally, Mobil 1 Advanced Fuel Economy provides faster lubrication and less viscous drag than higher viscosity oils, while providing exceptional wear protection and helping keep your engine clean and running like new.

* Based on 0.2-2.3 percent potential fuel economy improvement obtained by switching from higher viscosity oils to a 0W-20 or 0W-30 grade. Actual savings are dependent upon vehicle/engine type, outside temperature, driving conditions and your current engine oil viscosity.


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