W115 FLUID CHOICE
Hello. My car is 1974 w115 230.4 manual transmission. I will change the transmission and differential oil. The car manual says ATF II for transmission and hypoid SAE 90 gear oil for differential. However, some friends recommend hypoid 90 gear oil for the transmission and hypoid 140 gear oil for the differential. I got confused and would like to ask you. Thanks in advance for any experience or recommendation.
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