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Version A: Draining and topping up the front axle transmission oil

NOTE: TECHNICAL INFORMATION 
Filling to the lower edge of the oil filler opening means that the front axle differential is overfilled. In some cases, this may lead to emerging oil from the ventilation opening on the front axle differential.
After having drained the front axle transmission oil, repair the front axle differential or upon initial filling of a new replacement front axle differential, the transmission must be filled with 450 ml of oil.