Forum Discussion
427435
May 03, 2015Explorer
A 5w-20 oil is no thinner at, say 0 degrees, than a 5w-40 oil. They both meet the viscosity requirements for a 5w oil at cold temps. And a 5w-40 oil is far thinner at operating temp than either 5w-20 or 5w-40 is at start up temps.
The person that said the 5w-20 oils are for improved mpg is spot on.
The person that said the 5w-20 oils are for improved mpg is spot on.
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