The deal with the low vis oils is that you get higher rpm's
A quote from the Cool Power site . . . . Remember, this is actually an advertisement
"Cool Power MV (multi-viscosity) combines the low viscosity lubricant used in our #1 selling 30% Helicopter fuel and the unmatched ultra–high viscosity base fluid used in our traditional Cool Power.
The viscosity or thickness of the oil package determines how it lubricates. Lower viscosity or thinner lubricants disperse easily into the fuel and offer less fluid friction allowing your engine to run cooler and turn up faster. In contrast High-viscosity or thicker lubricants offer superior plating action (minimizing metal to metal contact) requiring a much lower volume of oil which translates to a higher percentage of combustible material in the fuel mixture.
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This is the S&W site. Notice the high rev and race blends</p>
http://s-whobby.com/prices.html
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http://www.klotzlube.com/proddetail....uart&cat=8