I had a cat ruined from some gas I bought in Needles Ca. It had the words Leaded on the pump side from the days when that pump was a leaded station. My S-10 ran fine, till that trip. When you need gas in Needles, you get gas in Needles, there just isnt another on the next corner. (10 years ago) Destroyed the Cat, made a ton of back pressure for the manifold which in tern destroyed the manifold bolts, and overheated the clutch's plastic hydrauloc line, and I lost that. Too bad I was pulling a Uhaul to Texas.

POint is don't use leaded gas.

Right now, my starter is acting up. Each time I start, raw fuel gets dumped through the cold start injector and after turning the key a few times, it starts . That fuel doesn't all burn, so it pumps through the Cat. I am sure that it will destroy my cat if I dont fix it first. Luckily the cat isnt hot when that happens.

There are a couple of things that will destroy a cat. (back on topic)