# Diff oil and how much
**URL:** https://community.electricforum.com/t/diff-oil-and-how-much/24490
**Category:** Uncategorized
**Created:** [June 21, 2022, 1:01am UTC](https://community.electricforum.com/t/diff-oil-and-how-much/24490 "2022-06-21T01:01:10Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@Abuzzon1](https://community.electricforum.com/u/Abuzzon1)
#### Post date: [June 21, 2022, 1:01am UTC](https://community.electricforum.com/t/diff-oil-and-how-much/24490/1 "2022-06-21T01:01:10Z")
Can anyone tell me how many ounces of Diff oil is needed in a 2001 Gem E4. I’ve heard anywheres from 10 oz. To 18oz… any real spec for how much? Thanks
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### Author:  [@JarJarJava](https://community.electricforum.com/u/JarJarJava)
#### Post date: [June 21, 2022, 2:22am UTC](https://community.electricforum.com/t/diff-oil-and-how-much/24490/2 "2022-06-21T02:22:14Z")
Approximately 152 drams…
On level ground, fill to the bottom of the plug hole in the differential cover. It’s between 9 to 10 oz.
OEM spec is for 30w this was done to reduce resistance (it’s a splash lube gearbox) so they could squeeze more range out of the battery back in the dark ages of EVs.
Most of us run 80-90 gear oil to quiet it down.
In both instances, just plain old oil is fine. No need for synthetic. These are not high speed, high pressure, or hot.
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### Author:  [@Abuzzon1](https://community.electricforum.com/u/Abuzzon1)
#### Post date: [June 21, 2022, 2:58pm UTC](https://community.electricforum.com/t/diff-oil-and-how-much/24490/3 "2022-06-21T14:58:46Z")
Thank u for replying . I do go 40 mph so is 80 -90 oil still ok?
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### Author:  [@JarJarJava](https://community.electricforum.com/u/JarJarJava)
#### Post date: [June 21, 2022, 3:20pm UTC](https://community.electricforum.com/t/diff-oil-and-how-much/24490/4 "2022-06-21T15:20:58Z")
80-90 should be fine imo.