2.3L(except turbo, no air). How viscous should the oil I use be when I change the differential oil?
Hello t_man123-- Consensus of those I talked with about differential oil for your 1988 Ford Mustang is that a 75W90 oil is what you should use. Most of my sources recommend addition of a friction modifier. These same sources were undecided about whether you are better off using the Ford product or a less expensive brand. For a nice forum on this topic, go to http://groups.google.com/group/rec.autos.makers.ford.mustang/browse_thread/thread/1299f5117f9e9b7e/f5334b4992066150%23f5334b4992066150. Good luck from Bovan.
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