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Old 10-18-2020, 08:38 PM   #1
mgerhold
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Default rear end oil

what should i use for rear differential oil in my 1953 mercury? can i use the Lucas 80w90 gear oil without any problems?
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Old 10-18-2020, 08:47 PM   #2
Clem Clement
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Default Re: rear end oil

Is it GL4?
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Old 10-18-2020, 08:54 PM   #3
mgerhold
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Default Re: rear end oil

its says it exceeds gl5. do i need to run gl4 gear oil?
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Old 10-18-2020, 09:38 PM   #4
Talkwrench
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Default Re: rear end oil

No you dont in the diff.
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Old 10-18-2020, 09:38 PM   #5
JSeery
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Default Re: rear end oil

Quote:
Originally Posted by mgerhold View Post
its says it exceeds gl5. do i need to run gl4 gear oil?
Not in a rear axle, GL5 is a transmission issue, not a rear axle issue. High EP additives can attach "yellow" metals, like those found in a transmission. That should not be an issue in a rear axle.
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Old 10-19-2020, 09:56 PM   #6
mgerhold
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Default Re: rear end oil

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ok so using the Lucas 80w90 gear oil in the rear axle should be fine. just wanted to make sure.
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