“Taking 05W-20 oil as an example, the number before the ‘W’ stands for ‘winter’ and refers to the cold viscosity performance, and the one after it stands for the oil’s viscosity after the engine has warmed up.
“In the 1990s, 20W-50 and 10W-30 were the most commonly used oils, but today these have been superseded by 05W-20 and even 0W-20 oils in newer engines.”
With standards improving for the fuel efficiency of vehicles, drivers are set to benefit from having to visit the petrol station less often.
Automotive manufacturers are also under constant pressure by consumers to improve the fuel economy of their vehicles.
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