Hi, and welcome. There’s numerous posts on this topic. Searching the forum will provide some info, both the 140 series and Amazon/1800. They used the same engine and differentials Best to check the owners manual too. I assume an M40 4 speed? Motor oil 30 W or 20w50. GL 4 Gear oil as well, not hypoid, 80-90 is fine for the transmission too.
For the differential HYPOID/GL5 gear oil approx 80-90 weight is what you need.
You might find it helpful to get your hands on a Haynes manual for the Volvo 140 series. Lot of info there.
Cheers
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