96 Jeep Cherokee 4 L needs to swap differential fluid Dana 30. The manual says to use 75w-90. Do you think I should use synthetic 74-140 instead because I'm often on road?
Yes, you are going to get more protection that way. If you are on the road a lot and there is a lot of strain, do it. It's a better oil. If you want to have a technician change the oil for you, YourMechanic can provide the correct oil and perform this task for you at your home or office.
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