OK, here it is. Just got my new original manual for my euro W126 380SE. It says 1.3L Hypoid gear oil SEA (sic?) 90, 85W90. So, I figure I should change it, since who knows when it was changed if ever on this thing. My question is: what is the allen wrench size(s) for the drain and fill plugs so I can procure them?
I filled using Red Line Full Synthetic 75W-90. And yes 14mm does both plugs, thank you very much. funny thing is supposed to take 1.3L , was full to start. Took almost the entire 2L to fill. Are there optional diffs that could require the xtra lube? No leaks.
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