Fuel saving tips: Drivers warned of a mistake that can result in ‘staggering’ fuel costs

GSF Car Parts stated: “When buying motor oil, look for some important numbers that indicate its viscosity.

“Taking 05W-20 oil as an example, the number before the ‘W’ stands for ‘winter’ and refers to cold viscosity performance, and the number below represents the viscosity of the oil after the engine has warmed up.

“In the 1990s, 20W-50 and 10W-30 were the most widely used oils, but today they have been replaced by 05W-20 and even 0W-20 oils in newer engines.”

With vehicle fuel efficiency standards improving, drivers will benefit from having to visit the gas station less often.