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I'm going to defer to the FSM and say stick with 5W-30, or 10W-30 if it doesn't get below 0F. Synthetic or conventional doesn't matter. Brand doesn't matter. Oil additives are not necessary, and use at your own risk. Just make sure you use the right viscosity and change it often.
If you have a modified engine, consult your engine builder for viscosity and brand recommendation.
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