Originally Posted By: wolf_06
Originally Posted By: 440Magnum
O2 sensors are damaged by the same things that damage catalytic convertors. Lead, manganese, and other heavy metals primarily. Silicates and acetates from some gasket-forming materials will also hurt them, but not so much catcons.
Black deposits mean your engine is running stupid rich, not necessarily that the O2 sensor has any problem at all (although a bad O2 sensor can make an engine run rich, it usually doesn't make it STUPID rich like a bad MAF/MAP or leaky fuel injector can.
I disagree that oil burning will make an O2 sensor look black. O2 sensors are located in the hottest part of the exhaust stream- if the fuel mixture is right, an oil-burning engine will still not have BLACK deposits there, it will have crusty white ashy residue- just my experience.
yes you are right, i used lucas fuel treatmemt a lot, its very oily, is the high rev or too much cleaner im oil and gaz do that?
Stop using Lucas fuel treatment. It is motor oil with a few detergents.
Almost useless and it's not cheap.
This is not because of the dirty O2 sensor, but good advice.