Reply To: Gear lube flush on ‘57 Mark 25 Merc

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July 30, 2023 at 7:30 am #278655
CHUCK WEBSTER
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    I put new 105 in after every run.  The fill plug is at the bottom of the gear case and the over flow small screw is at the top. I think the fill and flush is for flushing the motor with water if it was used in salt water.