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Water in oil Mercury 115 4 stroke

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I recently notice after 2 trips this yr on lake o trolling both days approximately 20 hrs total at 2.5 mph I now have milky engine oil . Seems to be a common problem if the thermostat is stuck open but mine apears​ to be working fine, spark plugs look good to . Could it just be I never got it totally warm enough or is there something else I should be checking ?
Sent from my XT1254 using Lake Ontario United mobile app

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