Reply to "O2 value"

Gordon NicholsMassachusetts 1993 CMC Supporting Member

As I understand it, the stuff that made the inside of our exhaust pipes that nice, gray, leaden color was, in fact, the lead in the gasoline we were buying back then. The same thing occurred on my Dad’s school buses - exhaust pipes that had been gray once turned sooty black after the refineries went to non-leaded gas delivered to Massachusetts starting around 1980.

3/15/216:04 PM

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