Originally Posted By: IndyFan
Would flash point in a used oil analysis be a more accurate snapshot, since it is one sample of oil, complete with all additives, (albeit used)? In other words, when I look at a UOA from my engine, is the flash point measured from that sample accurate? I know it won't relate to the flash point in the virgin oil, obviously because of use and contaminates, but maybe it is a useful number to tell how that specific oil in the engine held up?
I don't consider any single run flash point to be accurate. A Closed Cup flash point (ASTM D 93) can be useful in determining fuel dilution in used oil, but not how well the oil held up. The more common Cleveland Open Cup (COC) method used for virgin oils may miss some or all of the fuel.
Would flash point in a used oil analysis be a more accurate snapshot, since it is one sample of oil, complete with all additives, (albeit used)? In other words, when I look at a UOA from my engine, is the flash point measured from that sample accurate? I know it won't relate to the flash point in the virgin oil, obviously because of use and contaminates, but maybe it is a useful number to tell how that specific oil in the engine held up?
I don't consider any single run flash point to be accurate. A Closed Cup flash point (ASTM D 93) can be useful in determining fuel dilution in used oil, but not how well the oil held up. The more common Cleveland Open Cup (COC) method used for virgin oils may miss some or all of the fuel.