How much leaded fuel use does it take to ruin the catalytic converter? I bought 5 gallons of 110 octane racing gas before realizing it's leaded. Thanx.

 

The leaded gas will overheat and melt the monolith,when the converter overheats it will become clogged, And you will have serious engine performance problems. The lead will also "stick" to the oxygen sensors and ruin them. It's best not to run leaded fuel in anything with a converter or EFI.

 

[QUOTE]Originally posted by SlowS2K:

 

what about for those guys that don't have a cat? Is the primary O2 sensor the only one to be concerned with?

 

[QUOTE]Originally posted by zid
[B]How much leaded fuel use does it take to ruin the catalytic converter? I bought 5 gallons of 110 octane racing gas before realizing it's leaded.