# Question about rotten egg smell (safety)

**URL:** <https://community.cartalk.com/t/question-about-rotten-egg-smell-safety/185290>\
**Category:** Maintenance/Repairs\
**Tags:** nissan, sentra\
**Created:** [July 16, 2022, 2:57pm UTC](https://community.cartalk.com/t/question-about-rotten-egg-smell-safety/185290 "2022-07-16T14:57:17Z")\
**Posts on this page:** 4\
**Page:** 2

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**Author:** ![circuitsmith](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/circuitsmith/32/40376_2.png) [@circuitsmith](https://community.cartalk.com/u/circuitsmith)\
**Post date:** [July 17, 2022, 3:04pm UTC](https://community.cartalk.com/t/question-about-rotten-egg-smell-safety/185290/21 "2022-07-17T15:04:51Z")

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> [@oldwaysx](#):
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> then it goes away as soon as I start driving or only lasts a few minutes

To me that means you only smell it before the cat converter warms up.  
This is normal.

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**Author:** ![shanonia](https://avatars.discourse-cdn.com/v4/letter/s/9de053/32.png) [@shanonia](https://community.cartalk.com/u/shanonia)\
**Post date:** [July 17, 2022, 4:16pm UTC](https://community.cartalk.com/t/question-about-rotten-egg-smell-safety/185290/22 "2022-07-17T16:16:19Z")

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> [@Nevada\_545](#):
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> There should not be any dirty air entering the car through the foot well.

True, but it can happen. There is some sort of boot or gasket on the firewall, where the steering shaft goes through. Twice on my Chrysler minivans the bellows on this thing has split, letting in some sound and, if present, some smell.

Check that and all grommets, etc. on the firewall.

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**Author:** ![George\_San\_Jose1](https://avatars.discourse-cdn.com/v4/letter/g/e5b9ba/32.png) [@George\_San\_Jose1](https://community.cartalk.com/u/George_San_Jose1)\
**Post date:** [July 17, 2022, 10:17pm UTC](https://community.cartalk.com/t/question-about-rotten-egg-smell-safety/185290/23 "2022-07-17T22:17:38Z")

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> [@oldwaysx](#):
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> s gear oil only used in a manual transmission? I have a CVT automatic

Varies car to car. What type of transmission fluid is recommended in the owner’s manual?

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**Author:** ![Nevada\_545](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/nevada_545/32/41232_2.png) [@Nevada\_545](https://community.cartalk.com/u/Nevada_545)\
**Post date:** [July 17, 2022, 10:33pm UTC](https://community.cartalk.com/t/question-about-rotten-egg-smell-safety/185290/24 "2022-07-17T22:33:14Z")

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I’ll guess that the owner’s manual states to use Nissan CVT fluid in the transmission, not hypoid gear oil.

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