850 oil
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If the front gear case oil has been in there awhile then yes it will be a little dark. But seems like the older ones for example, the old hub activated awd systems the oil drained a lot of times as clean as what I put back in,BUT the hub oil would be black and nasty! The gear case on these models were a lot simpler and ran cleaner. I wouldn't be alarmed if its a little dark. Just keep it changed regularly. Normal for it to be a little off colored as all the awd parts are in the gear case! OPT