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Hello my name is Jason.
I read what you wrote. 25W40 is okay to use as long as the temperatures are above 40F. If temps creep below 40F then you would want to use 10W30. Any good automotive brand of 10W30 is also acceptable to run in the engine. It does not necessarily have to be "marine" rated oil. I'm also attaching the oil specifications for this engine just in case you wanted to see it first hand. See attachment -
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Thanks in advance, and good luckJason