Vvmvbb said: Click to expand...Clearly not true as most modern cars are using RTV for most gasketing. HOWEVER, what you are referring to was true in the past. There are two types of RTV. The original Dow Corning 732 was Acetic Acid based and would screw over oxygen sensors. The newer versions of RTV, for example Permatex's Ultra series of Blue, Grey, Black, Copper, & Red use what is known as Oxime silicone. These are oxygen sensor safe. Anyway either type would work to seal a hole in a firewall as the only problem would be if the acetic acid would get into the exhaust stream which seems impossible to me if you're sealing a hole in a firewall.
Clearly not true as most modern cars are using RTV for most gasketing. HOWEVER, what you are referring to was true in the past. There are two types of RTV. The original Dow Corning 732 was Acetic Acid based and would screw over oxygen sensors. The newer versions of RTV, for example Permatex's Ultra series of Blue, Grey, Black, Copper, & Red use what is known as Oxime silicone. These are oxygen sensor safe. Anyway either type would work to seal a hole in a firewall as the only problem would be if the acetic acid would get into the exhaust stream which seems impossible to me if you're sealing a hole in a firewall.
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