Thanks to PimTac for the find.
http://www.freepatentsonline.com/y2017/0029734.html
Quote:
A lubricant formulation which is effective to remove or prevent carbon deposits in internal combustion engines has a solvency as defined by aniline point from about 20 to about 115, a volatility (as measured by NOACK) of less than 15%, an oxidative stability (as measured by PDSC) of above 40 minutes and a base oil viscosity of above 2 and below 10 cSt. The lubricant formulation can be formed from a blend of Group III, IV and V lubricants, in particularly polyalphaolefins, alkylated naphthalenes and polar Group V base stocks such as polyol esters. The carbon deposits can be removed from the engine piston by simply running the engine with the lubricant for one required cycle, or can be used continuously in the engine to prevent buildup.
Quote:
Typical lubricants used in internal combustion engines are designed to retard deposit formation but not to remove the carbon buildup that has accumulated over time. This is especially relevant in modern internal combustion engines where additional performance demands have increased piston temperatures.
http://www.freepatentsonline.com/y2017/0029734.html
Quote:
A lubricant formulation which is effective to remove or prevent carbon deposits in internal combustion engines has a solvency as defined by aniline point from about 20 to about 115, a volatility (as measured by NOACK) of less than 15%, an oxidative stability (as measured by PDSC) of above 40 minutes and a base oil viscosity of above 2 and below 10 cSt. The lubricant formulation can be formed from a blend of Group III, IV and V lubricants, in particularly polyalphaolefins, alkylated naphthalenes and polar Group V base stocks such as polyol esters. The carbon deposits can be removed from the engine piston by simply running the engine with the lubricant for one required cycle, or can be used continuously in the engine to prevent buildup.
Quote:
Typical lubricants used in internal combustion engines are designed to retard deposit formation but not to remove the carbon buildup that has accumulated over time. This is especially relevant in modern internal combustion engines where additional performance demands have increased piston temperatures.