Hi, I bought 116 racing gas, since is leaded I wan to know if someone is using, some people tells that i will destroy my O2's but In the store told me that i can use it without problems, they recomended mix it with 91 unleaded (3:1), they toldme that their cars are runing like that and no problem whit the O2's.

 

I have run it many times almost straight (no mixing with pump gas) many times with no problems. If you don't use it all the time, your o2's will be fine. After running it, you will notice the inside of your exhaust tips will be gray instead of black. Don't use a leaded gas with a catalytic converter though. It will clog it up.

 

The stock sensors are "rated" for 50 hours exposure to lead. NGK has a replacement narrow-band O2 sensor that is supposed to be twice as tolerant of lead exposure as the "standard" OEM narrow-band sensors.

But those exposure tolerance levels are predicated on much lower lead levels than you find in (I assume you are talking about) VP Fuels C16. That contains 6 grams/gallon lead, which is probably at least 5X what the sensors are time rated at.

I run straight C16 on a regular basis, and I still have a set of stock O2 sensors, mainly to plug the holes in the header collectors (the engine runs open loop, off an aftermarket ECU). But I can still watch the stock sensors with my ScanMaster. One of them appears to still be giving the correct mV readings, but the other one is showing about 200mV less than is should be. And since the lead may also "slow" them down, I think that you need to look at switching times as well, and I have no way to do that.