To the OP.
Changing the Gearbox fluid is very worthwhile and easy to do but make absolutely certain that you choose the correct fluids for your vehicle.
The oil that Zchas13 links to in post 2 is supplied by a very reputable company and being JWS 3309 spec is the correct oil for my 2007 XC90.
Later cars ( not sure of date ) had altogether different gearbox oil requirements to this so make sure that you thoroughly check to see what specification oil is required .
It could be a very costly mistake if you get it wrong.
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“Do the right thing. It will gratify some people and astonish the rest.” – Mark Twain 😊
2007 Volvo XC90 D5 SE Geartronic
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