Quote:
Originally Posted by twotonezed
I used Eneos 0w-50 in the Cadillac STS4 I used to own. I wanted to use a really good oil in it. The problem is that I actually got worse gas mileage for some reason. I didn't change anything else so it had to be the oil. I am not sure why it would be worse but it was. I most likely won't use Eneos oil again.
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It's thicker so you have more resistance, therefor less power and worse economy at normal temperatures. On the flip side it will offer more engine protection at 260F vs 5W30. It will not alter oil temperatures for the better.