just bought a 2017 S60 used and super cheap, although it looks like it went to hell and back, gonna fix it up, has 79k miles on it, not too shabby...

I don't plan on going to the dealer and a good friend has a garage with tools and a lift, so I am good there, plus he will help me out, I bought replacement belts, and plan to change all fluids, but noticed a severe gear lube available, see here:
https://www.searchforparts.com/oil-c...b4204t43-turbo

it says it is for the differential, I looked that up, it's basically rear axle oil?? I always have known to change the oil, transmission, brake fluid, power steering, but ya never hear "hey change the differential oil"

so is it worth it, from what I see it looks like a bit of work, really don't want to mess with something I have no experience with, opinions welcomed!