My notes and service history say 85W-140 gear oil for my 1980 242 DL with 4 speed manual (M45) transmission.
I checked FAQs, which recommends 75W-90.
https://www.brickboard.com/FAQ/700-900/Driveline.htm#DifferentialOilChangeRecommendation
My Haynes and Bentley recommend GL-5 90 (my temps don't go below 15' F/C).
As a parallel, the Toyota front-wheel driver folks prefer GL-4 over GL-5 in non-limited slip differentials/transaxles.
Because my Volvo does NOT have a limited-slip differential, should I use GL-4, eg Red Line MT 75W-90, or am I okay with Mobil 1 75W-90?
How about Motul 300 75W-90?
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