Would using the ceratec additive be harmful to O2 sensor and Cat if my Subaru is burning a little oil? (About 0.3qt/1000 miles)
About 1.5k miles after I used this additive with my oil change I am getting a p0420 code. Only other change is a k&n air filter. I ordered new O2 sensors which it probably needs anyways 263k miles. Just to be safe should I do an oil change before replacing the O2 sensors?
Thanks
About 1.5k miles after I used this additive with my oil change I am getting a p0420 code. Only other change is a k&n air filter. I ordered new O2 sensors which it probably needs anyways 263k miles. Just to be safe should I do an oil change before replacing the O2 sensors?
Thanks