MyE28.com

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?

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

a wrote: Jul 02, 2021 8:32 PM Is this a recent development from both cars? Change gas brands.

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

Well here's one solution...

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.

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

Ken H. wrote: Jul 07, 2021 6:33 PM We had a similar problem.
We changed the cat food.

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

Ken H. wrote: Jul 07, 2021 6:33 PM 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.