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how too top up gearbox oil

  1. BMW 3 Series Forum - Technical Talk on the BMW E21
    Hi, I recently had a leak on the return cooling pipes for the gear box oil, that's now been sorted but I must have lost a good amount of oil as it now slips outta gear when I stop at junctions, my prob is this, have no idea how too top the oil up, I thought there would be a service hole on the...