Be sure to order the correct oil for your manual transmission. The M90 uses fully synthetic oil. Don't use ATF. ATF are used in M46/M47 gearboxes. I provide some photo and links below.

Turbobricks has updated oil listing for the M90:
https://forums.turbobricks.com/showthread.php?t=94325
In short your M90 uses oil #1161745, #1161645 or #1161423. In case its hard to get proper Volvo oil, Skandix offers equivalent oil from LiquiMoly, similar to #1161745:
https://www.skandix.de/en/spare-parts/accessories/chemicals-consumables/oil/transmission-oil-manual-transmission-1-l-75w-80/1058457/
Take care of your precious M90. You have a very nice car there!
Amarin
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