How detrimental is it to...

Red__Zed · 01-12-2011, 08:41 PM

Quote:

Originally Posted by ChrisSlicks

In a perfect world they would want the oil to have the ideal properties of both, both the reality is that it is currently impossible. Trade offs have to be made at either end. Given that the oil spends most of its live at operating temperature they make a few more trade offs in the lower range.

I understand that, but I thought it had to meet the cranking and pumping specs of the lighter weight oil at 40C?

ChrisSlicks · 01-13-2011, 06:49 AM

Quote:

Originally Posted by Red__Zed

I understand that, but I thought it had to meet the cranking and pumping specs of the lighter weight oil at 40C?

They do. But it doesn't have to pass the full SAE test regiment that they do at operating temperature. The cranking and pumping tests aren't very tough, basically just there to assure that your oil won't turn to molasses at lower temperatures. It's the other standard tests such as the API (currently SN standard) that are more important and test the wear resistance and longevity of the oil.

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