Sorry to resurrect a thread from the dead, but I'm at a complete loss on these references to "chain drive oil". I've changed the rear diff, AOC, transmission and angle gear, but what is this other fluid? And where does one even access it? Google searches yield very little outside of this t...

Worth noting that I have done the angle gear and rear differential on my 2013 XC90 3.2 AWD.

The angle gear on this model looks quite a bit different than the one shown in the pic, but it's actually even easier to get to. Just a vanilla simple 3/8 ratchet with the correct socket will remove the plug.