My AC Delco replacement came dry with no anti seize. I had to use my own but it'* an industrial high heat silver compound.

Thanks for all the info....

After some digging, I did find the thread size to be 18mm x 1.5.

Also found the Heli-Coil repair kit for O2 sensors, but the average cost is about $100
That'* a bit steep for a one-time repair! Looked for a place that might rent the kit, but had no luck. I did find a 18.5x1.5mm tap at work, so will try to chase the threads with the tap and hope for the best. Will let you all know how it goes...

FYI, the new AC Delco Sensor has what appears to be a very fine coating of the graphite and glass bead anti-seize. I read on another web site that standard anti-seize compounds should not be used because the sensor needs a path to ground thru the exhaust manifold, and a "liquid" anti-seize may interfere with the path and cause false readings???

Yup, don't mess with putting any more lubricant on the threads of the AC Delco sensor...its ready to rock 'n roll once you ge tthe threads all taken care of.

Sorry to hear about your mishap, that does indeed suck. At least you can get a tap down there -- there are a lot of other places this could of happened where there would be no room.

Well I lucked-out on this one...

Looks like the old oxygen sensor took most of the damage. The exhaust manifold threads were a little beat-up at the top, but once I got the tap started, all went well.

This O2 sensor replacement took a lot longer than I expected, but at least I didn't have to drop the $100 for the repair kit! :P

Congrats. I can imagine the stress and pain that job was. Well, at least it is over

I thought the grey/silver anti-seize used a metalic base so it wouldnt interfere with conductivity?

Yes you are right. That'* what I use and it works fine.