You'll need to make sure it is coming from the pipe seals - my last V70 had a leak from the top seal where the input shaft goes in. It's hard to see because it runs down the back of the joint. I'd hoped it was the pipe seals to begin with...
Eventually, after much topping up, taking it out and sending it off to Kiley Clinton for refurb sorted that.
The pipe seals can be done without dropping the subframe, coming in from the wheel arch with the plastic liner above the driveshaft removed. It is tricky, but possible.
If you've got screw in fittings, shortening some spanners to fit in the limited space helps a great deal.
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