Interesting.....I've heard of this smell quite a bit as others have mentioned but never a cause.
My F15 had this smell intermittently, I would notice it when hooking up to my trailer as I'd be standing right next to the exhaust. Not all the time though. Nothing from the G05 as of yet. I'd expect a smell like this from a diesel considering DEF/urea but from a petrol car not so much.
If you bring in for service....keep us posted.
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