SL-Class (R129) 1990-2002: SL 280, SL 300, SL 320, SL 500, SL 600, SL 60 AMG

SL/R129: Differential oil path questions

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Old Mar 22, 2026 | 01:57 PM
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1990 sl500
Differential oil path questions

I have a question regarding the oil path in the differential. I lost the marks on the differential side caps while taking it apart for a gear swap and new bearings. The side caps looks like it has oil entry for the bearing and exit so my question is which way does the oil holes need to line up. Have attached pictures of the extra set and mock up in the differential at random spot. I would assume the left side hole entry would be at somewhere toward the bottom of the diff and the right side would be opposite of that with entry towards the top.


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