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"<strong>Answer:</strong> Although it is best to follow the manufacturer’s recommendation, synthetic oil can be as much as 45-50 percent better and keep sludge and contamination in suspension compared to conventional oil. Synthetic engine oil also has a lower pour point and aids in colder weather start-up. Synthetic oil is also more resistant to oxidation and chemical degradation"
<https://boatbub.com/boat-gear/winterize-your-outboard-motor/>