Mower in topic hadn't had its oil changed in years, so it was changed by me earlier this season. The old oil was grey and the new oil (Auto Zone HD30) turned grey very shortly (checked after mowing right after changing the oil).
Is this normal or does the oil need several changes to flush it out before it will stay brown for a while?
Is this normal or does the oil need several changes to flush it out before it will stay brown for a while?