Hello all. For 2 MOT's now I've have had an advisory for oil mist on the gearbox, not this last one though. Had a look last week at the fill bolt to see what type it was and the box is almost dry of oil as though it had some but is now washed off. Got under today and removed the fill bolt and had a little dribble come out so put it back. Lovely and clear and smelt like the Hypoid 90 from old. Oil was replaced in 2018 55000 miles. I was expecting to add some but left it as it seemed okay. I had seen the car up on a ramp about a year after I bought the car and the box was oily but the mechanic said not to worry and keep an eye on it. I know that tyre shops used to spray oil on shocks to say they needed replacing, but an entire gearbox? Like I say it's a mystery. Mike.