I’m also interested in this as just bought a 59!plate xc90 with c. 195k. I did a 30mins test drive and box seemed to change very smoothly and kick down etc but down know if / when last changed. I’ve seen the big (20l) containers of Mannol on eBay to the Js3309 spec. Is this recommended ? Also what’s the best approach on something with this mileage. Drop and replace 3-4 litres over a few days/ weeks to gradually replace or alternatively the gibbons method to flush it all out? I feel more confident doing the sump drop method and I read that this is less likely to upset the box’s learned behaviour. Is this adequate or do I need to figure out how to do the gibbons method?
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