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Author Topic: Differential Oil  (Read 1555 times)

Harry

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Differential Oil
« on: April 11, 2023, 12:23:37 »
I am about to refill my 1966 230SL differential oil with new oil and I find an old container still having some oil from a prior fill (when IU replaced the boot with a split boot).  That oil is Valvoline 80W-90 with Limited Slip.  I just bought the same but without the "Limited Slip".  What are the recommendations on oil for the differntial?

Harry

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Harry Bailey
Knoxville, TN
1966 230SL
Automatic

Jowe

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Re: Differential Oil
« Reply #1 on: April 11, 2023, 18:28:29 »
You should use Hypoid gear oil SAE90. See the service manual at https://www.sl113.org/wiki/Restricted/ServiceManual
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Johan
04/1964 230SL, European, manual 4-sp, power steering, 050/050 white, black leather, Blaupunkt (SOLD)

kampala

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Re: Differential Oil
« Reply #2 on: April 11, 2023, 18:49:50 »
Do you have a Limited Slip Diff?    If so, you need the special oil designed for LSD.    Our Diffs have a special metal tag attached to the diff that mention Special Oil required if its an LSD (in German).

Sample photo - pulled of the net
« Last Edit: April 12, 2023, 00:10:55 by kampala »
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250sl - later - manual
280sl - 1971 - Auto - LSD

WRe

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Re: Differential Oil
« Reply #3 on: April 12, 2023, 05:59:59 »
Hi,
an "SP" can also be stamped next to the axle number and the axle ratio.
...WRe
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Harry

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Re: Differential Oil
« Reply #4 on: April 12, 2023, 15:21:24 »
No indication of limited slip.  Thank you!
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Harry Bailey
Knoxville, TN
1966 230SL
Automatic
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