For small outboards the oil would normally be changed every 50 hours. For large horse power outboard engines this may be every 100 hours. If you do not use the outboard very much and do not keep a record of the number of hours that it is in use, then always change the oil every year. High Tech Marine's Yamaha Certified Technician, Keith Hinze will COME TO YOUR BOAT. Call 832-385-9970 to schedule.
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When to change 4 Stroke Engine Oil
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When to change 4 Stroke Engine Oil
Keith Hinze Yamaha Certified Technician
High Tech Marine Mobile Service
832-385-9970
hightechmarine@yahoo.com