In comparing oils from Amsoil, Redline and Mobil 1, I noticed that Mobil 1 does not provide NOACK evaporative loss numbers for their synthetic oils or ATF products. I sent Mobil 1 an email asking for this data and the answer was "this information is not available." Is this data material in evaluating an oil's performance? If so, why would Mobil 1 not provide it unless it is relatively 'poor'? Your thoughts?