Improving fuel efficiency by selecting the right oil: The use of low viscosity lubricants is known to be an effective way to achieve better fuel economy.

The article offers information on the Shear stability which is a term that characterizes an ability of an oil to resist mechanical stress from opposing parallel forces. It discusses that Lower grade oils are not always thinner than higher grade oils and also so-called "winter"-graded engine oils perform better than "summer" oils at higher temperatures; and mentions that ambient conditions should no longer drive engine oil selection.