Flush every 40K if you've the 5 Speed.
Mannol produce a very decent JWS3309. Far cheaper.
If you do proper miles, add a cooler, as listed here:
https://www.volvoforums.org.uk/showthread.php?t=263883
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Bifuel V70 Classic 1999 [The Old Grumpy in the Corner, "When I was a lad... blah, bl**dy blah."]
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