Just change my gear oil on my 95 gt, store dont carry 75w90, so I get mobil 1 75w140 its ok ? and my rear diff cover dont have the magnetic ? and 1 last question, where is the rear diff vent hose ? because the gear oil came out with bunch of bubble, and i beleive it cause of water, just wonder where the vent hose for the rear diff at, thanks !