Quote:
Originally Posted by Scott@HKSUSA
All grades are "made up." SAE viscosity ratings are just that - a standardized viscosity rating system. If you started your own oil brand, you could specify a SAE 7W-36 blend if you wanted to. Now because HKS oil is designed & offered for modified or all-out racing engines, it isn't API certified, but that has nothing to do with the SAE viscosity rating.
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I didn't even realize you were from HKS USA.
I don't get it. A 40 grade means at oil that has a viscosity anywhere from 12.5 - 16.3 cSt's at 100C. Cold cranking viscosities are defined as well. There is no 42, 3.5, or 37. What is the viscosity at 100C of your 42 and your 37? Did you perform a cold cranking test to come up with a 3.5W and at what temp.?
Quote:
Originally Posted by Scott@HKSUSA
And I'll let you guys in on a little industry secret - despite the dozens of companies that offer performance oils, there are less than a handfull of refineries that produce, blend, and bottle for all of them.
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Yes, I know. There are only a few companies that make base oils and a few companies that make additives. But even most oil marketers/blenders follow the SAE J300 when producing and marketing oil. For example, Mobil1 0W40 is 13.5 cSt's at 100C and Red Line 0W40 is 15.4 cSt's at 100C. One is a thin 40 grade and one is a heavier 40 grade, but they're both 40 grades and not 39, 40.5, 41, 42, 43, or 44.
Do you post your product data sheets?