Why do you need to change your oil?
When you change your vehicle's oil you are helping to regulate the engine's operating temperature, and ensure proper lubrication. As a vehicle engine operates, microscopic engine wear particles are picked up by the oil and transported to the filter. Fresh high-quality oil absorbs engine heat and is better able to absorb and transport engine wear particulate.
Changing a vehicle's engine oil ensures that engine wear particles are removed. The changing of a vehicle's oil, hence the removal of engine "sludge" (degraded engine oil, engine wear particles, and dirt) helps to maintain peak engine operating efficiency, and fresh high quality engine oil is better able to reduce engine friction and absorb engine heat.
What is the role of engine oil in boosting fuel economy?
Basically motor oil is the lubricant for your car's engine. Old oil loses it's lubrication effect on the moving parts of your vehicle's engine. Therefore with more friction created by the moving engine parts while driving, results in a negative impact on fuel economy.