Well I had the same 31280771 as you last year, so when I saw this I went and had a chat with the guys at Holden Volvo in Norwich, who l know far to well!
So the correct spec is 1161645 but that is no longer available, it’s superseded by 31280771. That info got double checked by there UK technical support because I wanted to be sure what I was going to post is correct.
So yes looks like you have been given the wrong spec oil. 31280771 is the M90 spec for Volvo 940.
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