• Black gearbox oil, sure there isn't an additive that PSA add, is the gearbox the LSD as some get noisey and some additives to make it quieter .

    The gear oil in the X type should have been red if never changed but came out dark and almost dark chocolate colour! But then it is the ford MTX75 box so motor oil is the best thing for it in europe.

  • Might have been. From the factory they had an additive, but since then they have changed the recommendation to use a specific full synth gearbox oil. It's much quieter that it was that's for sure.

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