Quote:
Originally Posted by oceanview
Sorry for my late response.
First the 5w-40 has a higher viscosity as the 5w-30. Which means the 40 Oil is thicker compared to the 30 Oil.
At the same oil temperature the engine needs more power to run with a SAE40 Oil than with a SAE30 Oil.
http://articles.sae.org/11945/
So what you write makes no sense to me.
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There is no sense there, all you need to do is run 5w30 for awhile, then switch to 5w40 (motul, liquimoly) and you'll feel the difference.