Sulfur odor from cat

[Mike W.]

This is not in TT because it's not happening on an E28. Those cats are too good.

On both my E39, a 525it, and the Datsun, a Infiniti QX4, I tend to get a sulfur odor on mountain passes when they're working hard. Premium gas seemed to be a solution for a bit, but no longer. Not extreme, but I can smell it inside, windows up. Both run well with no CEL. Now there's a thousand products out there that claim to fix it, but do any of them? Or, are my options to either hold my breath and not breathe until I crest the hill or spring many $$$ for new cats?

[a]

Is this a recent development from both cars? Change gas brands.

[Mike W.]

Is this a recent development from both cars? Change gas brands.

Unfortunately not. More on trips than anything else and random brands.

[davintosh]

Well here's one solution...

[LeiseyJr]

If it’s multiple cars in that area, sounds like a feature of the experience for the area.
Cars are probably fine, like you said cats are working hard. Probably tired. Definitely a really interesting phenomenon though.

[Ken H.]

We had a similar problem.
We changed the cat food.

[e28Sean]

We had a similar problem.
We changed the cat food.

Dammit... I came here to post something similar.

[Mike W.]

We had a similar problem.
We changed the cat food.

It smells, but not as bad as the deposits that those vile little creatures deposit on my lawn, and sidewalk, and dirt etc.