leaded 110
Joe
P.S. All passes on motor
Increasing octane will also change your EGTs, so depending on where the O2 is mounted, the change in temp can change readings a little as well.
WBO2s can generally clean themselves with a few heat cycles, but can get contaminated with lead over time. I've killed a few narrowbands with race gas, but not a wideband so far.
I would recalibrate it and give it another chance.


