You know looking back at sample # 8 the following or Cat's protocol might need to be looked at. The viscosity has not been harmed, however...lubrosity can/could be effected:
Depending on application, for diesel engines, a cautionary limit is typically set at around 1.5% dilution (about -20° C flash) and a critical limit at 3% to 5% dilution (-40° C to -60° C flash). Application-specific calibration curves based on the actual test protocol (open cup, closed cup, etc.), motor oil brand/grade, and fuel type, will greatly improve precision in translating a drop in flash point to percent fuel dilution.
We will need some of the pro's to chime in at this point!!!!
"Success is the ability to go from one failure to another with no loss of enthusiasm."
– Sir Winston Churchill