quote:Problem is, many see zero consumption with Mobil 1 10w-30 and better consumption with Amsoil 0w-30 which has a 8.6% NOAK vs their 5w-30 at 5%. The correlation doesn't workout as I've noticed. I could be wrong but I don't see it. Viscosity plays a role for sure. Consumption is mostly due to driving conditions and the engine. A good synthetic will always be better with consumption.
People using Amsoil 0-30 and M1 15-50 seem not to have consumption issues
quote:This is an old post, but I think G-Man was right and I also think this is why Mobil has since removed Noak #'s from their PDS. They used to be available. They say AN's are cheaper then Esters but are they as good???
Hey Buster, know why the Noack went up with the SL version? SuperSyn PAO + hi treat rate of alkylated aromatic and no base oil esters
quote:More info here: http://www.paclp.com/profile/releases/1102nck_procB.htm
Noack Method: Significance & Use The Noack Volatility Test is used to determine evaporation loss of lubricating oils, an issue of particular importance in engine lubrication. Portions of an oil can evaporate under high temperature conditions, potentially altering oil properties such as viscosity. A low Noack score indicates an oil that will maintain its original protective and performance qualities for a longer amount of time. These oils perform better under heat, translating to better engine protection, longer oil life, and improved fuel economy. The Noack Volatility Test has long been a specification test for European motor oils. With the advent of ILSAC (International Lubricants Standardization and Approval Committee) and its GF-series specifications, this volatility test first entered United States test specs in 1992, becoming a requirement for North American motor oils when API SH/ILSAC GF-1 oils were introduced. In 1996, volatility limits tightened to 22% with GF-2 oils’ entrance on the market, then were again lowered in 2001 – this time for all grades – to 15% (or 13% for European synthetic motor oils) with GF-3 oils’ introduction. Volatility of engine oil, which has been shown to significantly impact oil consumption, is determined almost entirely by the base oil. Thus, lower oil consumption demands lower volatility base oils. All of this favors a shift from conventional solvent refined (API Group I) stocks to hydroprocessed stocks (Group II) with modestly lower volatility, helping blenders meet the volatility limit of 15% evaporation in the Noack test, as proposed by GF-3 for motor oils. Growing environmental concern in recent years has extended Noack’s original application scope, with car manufacturers applying evaporation limits for hydraulic, gear box and shock absorber oils. But, as these oils are extremely volatile at the standard Noack test temperature of 250°C, additional temperatures (i.e. 200°C, 150°C, or even 100°C) are applied to replicate actual operating conditions for these oils.