[Lyn Smith]

I have run Sunoco standard( purple) for years with no problems.Sometimes a drum will last years ,and still check.From what I have been told by the Sunoco reps, there is no such thing as a sealed drum from the factory. It comes from Sunoco in a tanker,and is put in the drums at the dealer.So if you get a drum that doesn't check,it got contaminated when it was loaded off of the tanker,or put in a tank at the track,or gas station.