In the event that the additive is to reduce friction in an engine you will want to insure the oil viscosity is the same before and after the additive is added. It is good to keep in mind the measure of "friction for the oil" is viscosity.
Lower viscosity oil tends to have less friction losses when run in an engine, with proper bearing clearances, than the thicker higher viscosity oils. Just look at the labels on a quart of oil - you will not find an energy saving label on a 50 wt oil.
In other words adding kerosene will lower an oils viscosity and very likely show a HP increase on a dyno test.
To compare the viscosity of two oil samples simply take a container (plastic baby bottle) and drill a small hole (1/16 to 3/32) in the bottom. Fill the bottle with the oil you wish to test and measure the time in seconds it takes for given volume to drain out. Repeat with the other sample. Note - the two samples must be at the exact identical temperature. Good Luck.
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