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Oil Data Sheets provide information about the quality of the lubricant.   One of the key numbers to look at is the NOACK number.   The Test is standardized as ASTM D5800.  The NOACK number is the percentage of evaporation that happens in 1 hour when held at 250 degrees.  It's a good measure of heat resistance and the ability to perform under extreme conditions.  The more a motor oil vaporizes the thicker and heavier they become, contributing to poor circulation, reduced fuel economy, increase oil consumption, and excessive wear and emissions.  A maximum of 15 percent loss is allowable to meet the API SL and ILSAC GF-3 specifications.   Interesting tidbit; AMSOIL Inc was the first Oil Company in the United States to use and report NOACK results in 1984.   Most oil companies list this information on their data sheets, but some do not.  These are not made up numbers, they are ASTM tests that companies pay to have done.  If oil companies do not publish this information it is likely out of embarrassment or it shows their flaws.  The Lower the number the better.  AMSOIL Signature Series 5W-20 has a NOACK volatility number of only 5.8.   Another oil I just researched for a customer has a NOACK Volatility number of 13.7!   Remember that is the percentage of evaporation that happens in 1 hour when held at 250 degrees.  13.7 may meet the minimum spec but when operating in a commercial environment in extreme conditions of heavy use, pulling heavy loads, with hundreds of thousands of dollars invested in equipment why chance it with an inferior oil?  AMSOIL provides the extra protection needed to keep equipment running and out of the shop with repairs.  AMSOIL Signature Series Oils for Gas and Diesel vehicles are designed in the lab and over engineered to provide the absolute best engine protection

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