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all 4 stroke engines can "make" oil under the right conditions when they idle a lot ( that includes cars and trucks that drive in slow moving traffic a lot)... especially in cold weather.. it's one thing that ATV manufactures warn users to keep an eye on when used in cold weather ... and as other's have suggested.. prop selection can make a difference as can a thermostat that is running "#^&#^&#^&#^&.. bottom line is if you own a 4 stroke outboard and troll a lot... you will need to increase your oil change intervals.. the perfect outboard has not been invented...YET ,they all have their faults.. but for me..I love the smell of 2 stroke oil in the morning...PS... I have always recomended changing the thermostat every 2-3 years when you change the water pump... it assures that it always come apart and is cheap insurance... they work together, why not change them together.
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