Only about 1/3 of the ATF sits in the sump when the car is shut off, so you can’t drain it all.

Using the transmission line let’s you pump it out so you can replace almost all of it.

YV1LW wrote: ↑03 Jan 2022, 07:53 I believe this is the lower end of an AW42 AWD version.

Is the bolt depicted in the photo just a drain plug?
...

Yes and yes.

Volvo part 977751 crush washer will fit both the oil drain plug and the AT drain plug - I think it fits the M56 drain plug too.

You can check fitment at either volvopartswebstore or at FCP of course.

You can google “ thermal expansion coefficient ATF” and bring back a few rabbits from the hole you vanish into, for dinner.

It’s something like 0.001 per C , which doesn’t sound like a lot but for 50C and 10mliters of ATF it will be order of 500ml expansion

Once you price out the 4C replacements , hiccups will be cured by the sudden gasping for breath …